Why is "Confusing 'weather' (short-term) with 'climate' (long-term)" a common mistake in Negative effects of climate change on fragile environments and people?

Why it happens: Both terms used loosely in everyday speech. How to avoid it: Climate = average over decades. Weather = day-to-day. A single hot day is not 'climate change'; a 10-year trend is. Source: Pearson 4GE1 Examiner Reports — Paper 2

Why is "Vague answers without figures (e.g. 'lots of polar ice melting')" a common mistake in Negative effects of climate change on fragile environments and people?

Why it happens: Students remember the concept but not the data. How to avoid it: Memorise key figures: +1.45°C 2024; 422 ppm; sea ice -13%/decade; SLR 3.6 mm/yr; GBR -50% since 1995; Pakistan $30bn 2022; Groundswell 143m by 2050. Source: Pearson 4GE1 Examiner Reports — Paper 2

Why is "Mixing up CAUSES and EFFECTS of climate change" a common mistake in Negative effects of climate change on fragile environments and people?

Why it happens: Questions ask one but answers slip into the other. How to avoid it: READ THE QUESTION. 'Effects' = sea level rise, bleaching, migration. 'Causes' = CO₂ from fossil fuels, deforestation, methane. Source: Pearson 4GE1 Examiner Reports — Paper 2

Why is "Generic answers with no named examples" a common mistake in Negative effects of climate change on fragile environments and people?

Why it happens: Students learn concepts but not real-world cases. How to avoid it: Always name a specific place + a specific figure. 'Maldives 80% land <1m'; 'Pakistan 2022 floods $30bn'; 'GBR lost 50% since 1995'. Source: Pearson 4GE1 Examiner Reports — Paper 2

Why is "Forgetting positive-feedback loops" a common mistake in Negative effects of climate change on fragile environments and people?

Why it happens: Students see climate change as linear cause-effect. How to avoid it: For top-band answers, explain at least one POSITIVE FEEDBACK loop — Arctic albedo, permafrost methane, Amazon dieback. Feedback explains why warming is non-linear. Source: Pearson 4GE1 Examiner Reports — Paper 2

Why is "Missing the climate-INJUSTICE dimension" a common mistake in Negative effects of climate change on fragile environments and people?

Why it happens: Climate change framed as an environmental issue only. How to avoid it: Note that LICs (Pakistan <1% CO₂; Pacific Islands <0.03%) suffer worst impacts. This earns AO3 evaluation marks in 8/10-mark essays. Source: Pearson 4GE1 Examiner Reports — Paper 2

Edexcel IGCSE Geography (4GE1)

Negative effects of climate change on fragile environments and people

Q: Why is "Forgetting positive-feedback loops" a common mistake in Negative effects of climate change on fragile environments and people?

Why it happens: Students see climate change as linear cause-effect. How to avoid it: For top-band answers, explain at least one POSITIVE FEEDBACK loop — Arctic albedo, permafrost methane, Amazon dieback. Feedback explains why warming is non-linear. Source: Pearson 4GE1 Examiner Reports — Paper 2

Q: Why is "Missing the climate-INJUSTICE dimension" a common mistake in Negative effects of climate change on fragile environments and people?

Why it happens: Climate change framed as an environmental issue only. How to avoid it: Note that LICs (Pakistan <1% CO₂; Pacific Islands <0.03%) suffer worst impacts. This earns AO3 evaluation marks in 8/10-mark essays. Source: Pearson 4GE1 Examiner Reports — Paper 2

0% Complete

Detailed Study Notes

Detailed notes on Fragile environments and climate change for Edexcel IGCSE Geography, covering key concepts, explanations, examples, and exam-focused revision points.

Negative effects of climate change on fragile environments and people — Pearson Edexcel International GCSE Geography (4GE1) Study Notes (spec 7.2c)

How global warming is reshaping FRAGILE ENVIRONMENTS (Arctic, coral reefs, glaciers, rainforests, low-lying coasts) and PEOPLE (extreme weather, sea level rise, food + water stress, mass migration). IPCC AR6 (2021-23) is the scientific foundation; 2024 was the first calendar year above +1.45°C above pre-industrial. CO₂ ~422 ppm vs ~280 ppm pre-industrial. Worked through with specific cases — GBR bleaching, Pakistan 2022 floods, Maldives sea-level rise, Himalayan glacier retreat — and the climate-injustice framing that LICs least responsible for emissions bear the heaviest costs.

At a glance

Global warming: +1.45°C above pre-industrial in 2024 (first calendar year above 1.45°C); CO₂ ~422 ppm vs 280 ppm pre-industrial.
Arctic sea ice: -13%/decade (NSIDC); ice-free summers projected ~2035; Arctic warming 2-4× global mean.
Coral bleaching: GBR lost ~50% of corals since 1995; mass bleaching 2016/17/20/22/24; >99% reefs lost at +2°C (IPCC).
Sea level rise: ~3.6 mm/year, accelerating; Maldives 80% of land <1 m elevation; Tuvalu Falepili Union with Australia (2023).
Glaciers: Himalayan glaciers shrinking ~0.5%/year, affecting 1.9bn downstream; Greenland losing ~270 Gt/year (GRACE).
Permafrost: stores ~1,500 Gt of carbon; thawing releases CH₄ (28× CO₂ potency).
Amazon: eastern Amazon flipped to NET CARBON SOURCE in 2020s (Gatti et al. 2021).
Extreme weather: Pakistan floods 2022 (~$30bn, 1,700 deaths); Europe heatwave 2022 (~60,000 deaths); Canada wildfires 2023 (~18m ha).
Climate migration: World Bank Groundswell projects ~143m internal climate migrants by 2050.
Climate injustice: LICs contribute <5% of emissions but suffer worst impacts.

What you’ll learn

Mapped to the Edexcel IGCSE 4GE1 syllabus (2026 onwards).

Describe the recent and projected negative effects of climate change on fragile environments (Arctic, coral reefs, glaciers, Amazon, low-lying coasts).
Explain how climate change affects people through extreme weather, sea level rise, food + water security, and mass migration.
Identify and explain positive-feedback loops that amplify warming (albedo, permafrost, Amazon dieback).
Discuss CLIMATE INJUSTICE — the moral imbalance between high-emitters and high-sufferers.
Use attribution science (e.g. World Weather Attribution) to evaluate the role of climate change in specific extreme events.
Apply named case studies (Pakistan 2022, Maldives, GBR, Himalayas) to written exam answers.

The scientific evidence for global warming

Temperature, CO₂ + ice/sea data show warming is real, measured, accelerating + human-caused.

Decades of measurement confirm the planet is warming + that human activity is the dominant driver.

Temperature. Global mean surface temperature is ~+1.45°C above the pre-industrial baseline in 2024 (the first calendar year to exceed +1.45°C, according to WMO, ECMWF Copernicus). The 10 warmest years on record have all occurred since 2014.

CO₂ concentration. Atmospheric CO₂ is ~422 ppm in 2024 (Mauna Loa Observatory record), up from ~280 ppm pre-industrial (1750). The current rate of increase (~2-3 ppm/year) is roughly 10× the fastest natural rate in geological records.

Other greenhouse gases. Methane (CH₄) ~1,920 ppb (up from ~720 pre-industrial); N₂O similarly elevated.

Ocean heat. Oceans have absorbed ~90% of excess heat from anthropogenic warming. Ocean heat content at all-time record in 2024.

Sea ice. Arctic sea ice declining ~13% per decade (NSIDC satellite record since 1979); Antarctic sea ice at record lows since 2023.

Ice sheets. Greenland losing ~270 Gt/year (GRACE); Antarctica losing ~150 Gt/year. Combined ~1 mm of sea level rise per year from ice-sheet melt alone.

IPCC AR6 (2021-23). The IPCC's Sixth Assessment Report states unequivocally that human activity is the dominant cause of observed warming since 1850, and that the climate is changing faster than at any time in the last 2,000+ years.

Examiner tip. Memorise the key numbers — +1.45°C, 422 ppm, -13%/decade, 3.6 mm/yr. Examiners reward precise figures over vague description.

+1.45°C above pre-industrial in 2024 (first such year).
CO₂ ~422 ppm vs 280 ppm pre-industrial (Mauna Loa).
Oceans absorbed ~90% of excess heat.
Arctic sea ice -13%/decade (NSIDC); Greenland -270 Gt/yr (GRACE).
IPCC AR6 (2021-23) confirms human cause.

Effects on the Arctic + polar regions

Sea ice loss, permafrost thaw, ice-sheet collapse + species + indigenous community impacts.

The Arctic is warming 2-4× faster than the global mean — 'Arctic amplification'. Multiple impacts compound each other.

Sea ice loss.

~13% decline per decade since 1979 (NSIDC).
2024 September minimum was the 6th lowest on record.
Ice-free Arctic summers projected for the late 2030s (some models say 2035).
Albedo feedback: ice reflects ~80-90% of solar radiation; open ocean only ~6%. As ice melts, more heat is absorbed, melting more ice — POSITIVE FEEDBACK.

Permafrost thaw.

Permafrost covers ~25% of Northern Hemisphere land.
Stores ~1,500 Gt of carbon — ~2× current atmospheric carbon.
Thawing releases CO₂ + methane (CH₄, 28× warming potential of CO₂ over 100 years).
Siberian craters (e.g. Yamal crater, 30 m wide, 2014) caused by gas explosions from methane release.
Permafrost thaw destabilises buildings, roads + pipelines in Russia, Canada, Alaska.

Greenland ice sheet.

Losing ~270 Gt/year (GRACE satellite mission).
Contributes ~0.7 mm/year to global sea level rise.
Surface meltwater can travel through 'moulins' to bedrock, lubricating ice flow.

Antarctica.

Less affected overall but Thwaites Glacier ('Doomsday Glacier', W Antarctica) is destabilising. If lost, contributes ~65 cm of sea level rise.

Species + ecosystem impact.

Polar bears: Hudson Bay subpopulation down ~30% since 1980s; sea-ice loss removes hunting platforms.
Walruses, ringed seals: ice-dependent species at risk.
Boreal forests under stress from drought + record fires.

Indigenous peoples.

Inuit + Sami communities face cultural disruption — disrupted traditional hunting, fishing + reindeer herding.
Newtok, Alaska has been relocating since 2019 as permafrost thaw + coastal erosion destroy the village.
Russian + Canadian Arctic infrastructure at growing risk.

Wider feedback to global climate.

Arctic feedbacks (albedo, permafrost) accelerate global warming beyond what current emissions alone would do.
AMOC may weaken with Greenland meltwater (~15% weakening since mid-20th century per Caesar et al. 2018).

Going deeper. The Arctic is the canary in the climate coalmine — but it is also a global engine driving wider climate change. Cuts in emissions today protect not just polar bears but the whole planet's stable climate.

Arctic warming 2-4× global mean (amplification).
Sea ice -13%/decade; ice-free summers ~2035.
Permafrost stores 1,500 Gt C; thaws release CH₄.
Greenland -270 Gt/yr; Thwaites Glacier destabilising.
Inuit, Sami + Alaskan villages (Newtok) face relocation.
Albedo feedback + methane feedback drive non-linear change.

Effects on coral reefs + ocean ecosystems

Bleaching from warming oceans + acidification + sea level + storms. GBR is the case study.

Coral reefs cover ~0.1% of ocean area but support ~25% of marine species + ~500 million human livelihoods. They are extremely sensitive to small temperature changes.

Coral bleaching mechanism.

Corals live in symbiosis with zooxanthellae — single-cell algae that give corals colour + ~80% of their energy via photosynthesis.
At >1-2°C above seasonal maximum, corals expel the algae as stress response.
Bleached corals are not dead but are starving. If heat persists for weeks, they die.
Ocean has absorbed ~90% of excess heat; warm-water 'marine heatwaves' (>1°C above climatology for 5+ days) are now ~2× more frequent than in the 1980s.

Great Barrier Reef (GBR), Australia — the textbook case.

~2,300 km long, world's largest reef system, World Heritage Site, ~$6bn/yr tourism + ~64,000 jobs.
MASS BLEACHING in 2016, 2017, 2020, 2022 and 2024 — FIVE mass events in nine years.
~50% of GBR coral has died since 1995 (Australian Institute of Marine Science).
2016 event killed ~30% of corals north of Port Douglas.
2024 was the 5th mass bleaching + first to affect the southern reef.

Ocean acidification.

Seawater absorbs CO₂ → carbonic acid → pH drops.
Ocean pH has dropped from 8.21 to ~8.10 since 1750 (~26% increase in H⁺).
Acidification dissolves calcium-carbonate skeletons of corals + shellfish.
Compounds bleaching damage.

IPCC projections.

+1.5°C: 70-90% of warm-water reefs lost.
+2°C: >99% of warm-water reefs lost.
With 2024 already at +1.45°C, reefs face near-total loss without urgent mitigation.

Other reef cases.

Caribbean reefs: ~80% lost since 1970s (stony coral cover).
Indo-Pacific reefs: similar bleaching pattern.
Andaman Sea, SE Asia: bleaching + plastic pollution + dynamite fishing.

Knock-on effects.

Fisheries collapse → food + livelihood crisis for ~500m people.
Coastal protection lost — reefs absorb ~97% of wave energy.
Tourism economies (Maldives, Caribbean) destabilised.
Biodiversity loss — corals support ~25% of marine species.

Going deeper. Some reef-restoration projects (heat-resistant coral cultivation, 'super corals') exist — but cannot compensate for whole-reef loss. Mitigation is the only ultimate response.

Bleaching = corals expel zooxanthellae at >1-2°C above seasonal max.
GBR lost ~50% of coral since 1995 (AIMS); mass bleach 2016/17/20/22/24.
Ocean pH 8.21→8.10 since 1750 (acidification).
IPCC: 70-90% reefs lost at +1.5°C, >99% at +2°C.
Reef loss = food + livelihoods for ~500m people; lost coastal protection.

Glaciers, the Amazon + other fragile systems

Himalayan glaciers feed 1.9bn; Amazon flipped to carbon source; tipping points loom.

Himalayan glaciers.

The Hindu Kush Himalaya region holds ~15% of the world's ice outside polar regions.
Glaciers shrinking ~0.5% mass/year since 2000 (ICIMOD + IPCC AR6).
~40% of glacier ice lost since the Little Ice Age.
ICIMOD projects 30-50% remaining ice lost by 2100 even at +1.5°C; 75% lost at +2°C.
Feeds 10 major rivers (Indus, Ganges, Brahmaputra, Yangtze, Mekong, etc.) supplying ~1.9 billion people across Pakistan, India, Bangladesh, Nepal, Bhutan, China + SE Asia.
Short-term: glacier melt amplifies floods (Pakistan 2022 had 50°C+ spring temperatures).
Long-term: dry-season flow declines → water stress + hydropower decline.
GLOFs (glacial lake outburst floods) increasingly common — e.g. Sikkim 2023 (~80 dead); Chamoli 2021 (~200 dead).

Andean + Alpine glaciers.

Andes glaciers (Peru, Bolivia, Chile, Argentina) shrinking ~30-50% since 1980s.
La Paz, Bolivia depends on glacier melt for ~30% of dry-season water.
Alpine glaciers (Switzerland, France, Italy, Austria) lost ~60% of 1850 volume.

The Amazon — approaching a tipping point.

Eastern Amazon flipped to net CARBON SOURCE in 2020s (Gatti et al. 2021, Nature).
~17% of original forest already cleared; tipping point at ~20-25% deforestation + warming.
2023 Amazon drought: Manaus river levels lowest in 121 years of records.
Brazilian Amazon deforestation: 60% rise under Bolsonaro (2019-22); ~50% drop under Lula (2023-).
Forest 'recycles' ~50% of its own rainfall via 'flying rivers'. Collapse would dry southern Brazil + La Plata basin.
Stores ~150-200 Gt carbon — release would raise CO₂ by ~50 ppm.

Boreal forests.

Record fires in Siberia + Canada (2023: ~18m ha burned in Canada).
Release stored carbon; reduce future sink capacity.

Mountain ecosystems.

Alpine meadows shift upslope as temperatures rise.
Endemic species 'pushed off' mountain tops.

Low-lying coastal ecosystems.

Mangroves in Sundarbans, Vietnam, Indonesia at risk from salt + storms.
Tidal flats in Wadden Sea + Korea bay losing area.

Going deeper. Climate scientists describe these as TIPPING ELEMENTS — components of the Earth system that could shift abruptly + irreversibly. The IPCC + recent research (Armstrong McKay et al. 2022) list 16 such tipping elements, several of which (Arctic sea ice, coral reefs, AMOC, Amazon) may be activated at +1.5-2°C.

Himalayan glaciers -0.5%/yr; feed 1.9bn downstream.
GLOFs: Sikkim 2023, Chamoli 2021 — deadly.
Amazon flipped to net carbon source (Gatti 2021); ~17% deforested; tipping at 20-25%.
Andes + Alps lost 30-60% glacier volume.
16 tipping elements identified (Armstrong McKay 2022).

Effects on PEOPLE — extreme weather

Floods, heatwaves, wildfires, hurricanes — climate change amplifies extremes. Pakistan 2022 is the showcase.

Climate change amplifies extreme weather by adding moisture + energy to the atmosphere. The Clausius-Clapeyron relationship means a warmer atmosphere holds ~7% more water vapour per +1°C.

Pakistan floods, 2022 (showcase case).

Worst floods in Pakistani history.
~33 million displaced; ~1,700 deaths; ~$30 billion damage (~10% of GDP).
~1/3 of the country underwater at peak; Sindh + Balochistan worst hit.
World Weather Attribution study found climate change made the 5-day extreme rainfall ~75% more intense than it would otherwise have been.
Pakistan contributes <1% of global CO₂ but suffered ~$30bn loss — textbook climate injustice.
Compounding factors: monsoon physics, Indus floodplain, deforested upper catchments, weak flood defences, poverty.

European heatwave, 2022.

~60,000 excess deaths across Europe (Lancet study).
Mostly elderly + low-income; UK exceeded 40°C for first time in records (Coningsby, 40.3°C).
Crop failures, wildfires, infrastructure stress.
Western European heatwaves now ~5× more likely than pre-industrial (WWA).

Canadian wildfires, 2023.

~18 million hectares burned (largest area on record; 2.5× previous record).
Tens of thousands evacuated; air quality alerts across North America.
Smoke reached the UK + Europe.
Driven by record warmth + drought + lightning.

Other named events.

Hurricane Otis (Acapulco, October 2023): rapidly intensified from tropical storm to Category 5 in ~12 hrs; ~$16bn damage. Sea surface temperatures unusually warm.
2023 Greek wildfires (Rhodes, Evia): tens of thousands evacuated; tourism disrupted.
2024 Atlantic hurricane season: above-average activity; Hurricane Helene caused devastating Florida + North Carolina flooding.
East African drought 2020-23: worst in 40 years; ~2.1m internally displaced in Somalia alone in 2022.

Health impacts.

Heat-related deaths increasing globally.
Tropical-disease range expanding (dengue, malaria moving to higher latitudes + altitudes).
Mental-health impacts from displacement + 'eco-anxiety'.
Smoke pollution kills thousands during wildfire events.

Economic impacts.

Global insured losses from natural catastrophes rose from ~ $50bn/yr in 2000s to ~$ 120bn/yr in 2020s (Swiss Re).
Property values declining in flood + fire-prone zones.

Examiner tip. Pakistan 2022 is the single most exam-worthy case study — combine the human + economic figures (33m, 1,700, $30bn), the attribution (75% more intense per WWA), and the climate-injustice framing (<1% emissions).

Clausius-Clapeyron: atmosphere holds +7% moisture per +1°C.
Pakistan 2022: 33m displaced, 1,700 dead, $30bn (75% more intense per WWA).
Europe 2022 heatwave: ~60,000 deaths; UK 40.3°C record.
Canada 2023 wildfires: 18m ha (record); smoke reached Europe.
Hurricane Otis 2023: rapidly intensified Cat 5; $16bn.
Insurance losses from natural catastrophes 2.5× since 2000s.

Effects on PEOPLE — sea level rise, food + migration

Maldives, Tuvalu + Bangladesh face existential risk; ~143m climate migrants projected by 2050.

Sea level rise.

Global sea level is rising ~3.6 mm/year and accelerating (satellite altimetry).
Up from ~1.4 mm/year in 1900s.
Drivers: thermal expansion (~50%); melting glaciers + ice sheets (~50%).
IPCC AR6 projects ~30-100+ cm rise by 2100 depending on emissions.

Low-lying islands (existential risk).

Maldives: ~80% of land <1 m above sea level. Building artificial islands like Hulhumalé (2,000+ ha reclaimed); explored buying overseas land. President has called climate change "an existential threat".
Tuvalu: 8 inhabited islands ≤4 m elevation. Signed the Falepili Union with Australia (Nov 2023) offering 280 visas per year — the world's first formal 'climate-mobility treaty'. Tuvalu has digitised its entire territory + government as a 'digital nation' contingency.
Kiribati: bought ~22 km² of land in Fiji as a future refuge in 2014.
Marshall Islands: most settlements <2 m elevation; large-scale emigration to USA via Compact of Free Association.

Coastal megacities at risk.

Jakarta, Bangkok, Ho Chi Minh, Lagos, Miami, New York, Shanghai, Mumbai all face severe SLR risk.
Jakarta is sinking + flooding → Indonesia is moving its capital to Nusantara (Kalimantan) by 2030s.
Miami experiences regular tidal flooding ('sunny day floods').

Bangladesh + the Sundarbans.

The world's largest delta. ~165m people; ~25% live <1 m above sea level.
Losing ~12 km²/year to erosion + salt intrusion.
Cyclone Aila (2009) displaced ~300,000; Amphan (2020) caused ~$13bn damage in India + Bangladesh.
The famous Bangladesh Cyclone Preparedness Programme (CPP) has reduced cyclone deaths from ~300,000 (1970 Bhola) to ~few hundred today — a model of adaptation.

Food + water security.

Heat stress reduces yields of staples (wheat -6% per +1°C; rice + maize similarly).
Glacier-fed rivers face declining dry-season flow → impacts ~1.9bn in Asia.
Salt intrusion ruins coastal farmland (Mekong delta, Bangladesh).
Pasture loss in Sahel + Horn of Africa drives food insecurity.
World Food Programme: climate disasters were leading driver of acute hunger in 2023.

Climate migration.

World Bank Groundswell Report (2021): up to ~143 million internal climate migrants by 2050 across sub-Saharan Africa, South Asia + Latin America under high-emissions, low-development scenarios.
IDMC: ~30m+ climate-related internal displacements/year already.
Climate is increasingly described as a 'threat multiplier' to conflict (Syria's 2007-10 pre-civil-war drought).

Cultural + indigenous loss.

Inuit, Sami, Pacific Islanders, Sundarbans tiger-reserve fishers, Aymara at Lake Titicaca: existential cultural threats.
Loss + damage extends beyond economics to identity, language, spiritual heritage.

Public health.

Heat-related deaths up.
Vector-borne diseases (dengue, malaria) expanding range.
'Climate anxiety' affecting young people globally.

Going deeper. The Loss + Damage Fund agreed at COP27 (2022) + activated at COP28 (2023) is a small (~$700m pledged) but symbolically important recognition that wealthier emitters have a responsibility to compensate harm to vulnerable countries — the world's first formal 'climate reparations' instrument.

SLR ~3.6 mm/yr accelerating; ~30-100+ cm by 2100.
Maldives 80% land <1m; Tuvalu Falepili Union with Australia (2023).
Jakarta sinking → new capital Nusantara by 2030s.
Bangladesh CPP cut cyclone deaths from 300,000 (1970) to few hundred.
Groundswell: 143m internal climate migrants by 2050.
COP28 (2023) Loss + Damage Fund: ~$700m pledged.

Climate injustice + judgement

Low emitters suffer most. HICs caused warming; LICs pay the price. Reparations debate matters.

Climate change exposes the deepest geographical inequality: the populations LEAST responsible for greenhouse gas emissions bear the WORST consequences.

Emission responsibility — top emitters.

Top 10 emitters (China, USA, EU, India, Russia, Japan, Brazil, Indonesia, Iran, Saudi Arabia) account for ~70% of current emissions.
Historic cumulative emissions (since 1850): USA ~25%, EU ~22%, China ~14%, Russia ~7%, Japan ~4%. The Global South collectively contributed ~10%.
Per-capita: USA ~14 tCO₂/person; EU ~6; China ~8; India ~2; sub-Saharan Africa <1.

Suffering — bottom contributors.

Pakistan (~0.6% global emissions): 2022 floods cost ~$30bn (10% of GDP).
Bangladesh (~0.3%): cyclones + SLR threaten ~25m people.
Maldives (<0.01%): existential threat from SLR.
Pacific Islands (collectively <0.03%): Tuvalu, Kiribati, Marshall facing relocation.
Sub-Saharan Africa (~4%): worst drought, food insecurity, displacement.
Inuit + Sami: cultural collapse from Arctic warming.

The moral case.

Polluter-pays principle: those who caused damage should pay to remedy it.
Historical responsibility: HICs grew rich on fossil fuels for 200 years; LICs are forbidden from doing the same.
'Common but differentiated responsibilities' (UNFCCC principle).

The policy response.

Paris Agreement (2015): legally non-binding NDCs; $100bn/year promised but underdelivered.
COP27 (2022): agreed in principle a Loss + Damage Fund.
COP28 (2023): Loss + Damage Fund activated; ~ $700m pledged (vs estimated need of ~$ 400bn/yr for vulnerable countries' adaptation).
Just Transition: ensuring climate action does not deepen inequality.
Carbon border adjustments (EU CBAM) shift trade in climate-aware direction.

Judgements students should be ready to make.

Climate change IS happening + IS human-caused. Scientific consensus is overwhelming (97%+ of climate scientists). Don't entertain false balance.
Effects on environments are first + visible. Arctic, reefs, glaciers, Amazon.
Effects on people are catastrophic + cascading. Floods, heatwaves, SLR, migration, food insecurity.
LICs suffer worst despite contributing least. Pakistan, Maldives, Pacific Islands. This is a moral + geographical injustice.
Only urgent global mitigation prevents catastrophe. Adaptation helps but cannot prevent ongoing loss.
The window is closing. At +1.5°C (almost reached), many tipping points activate. At +2°C, multiple unrecoverable losses (>99% coral reefs, multiple ice-sheet collapses, Amazon dieback).

A* upgrade. Top answers explicitly connect the SCIENTIFIC evidence with the MORAL framing. Climate change is not just a scientific or economic problem — it is the defining justice + sustainability question of the 21st century.

Top 10 emitters = ~70% emissions; top 10 sufferers contribute ~5%.
Pakistan <1% CO₂, $30bn 2022 flood loss.
Pacific Islands <0.03% CO₂, face existential SLR threat.
COP28 Loss + Damage Fund: ~ $700m pledged vs ~$ 400bn/yr needed.
Climate change IS happening, IS human-caused, IS unjust.

Quick recap

Global warming is real, measured (+1.45°C in 2024), and human-caused (IPCC AR6).
Arctic sea ice -13%/decade; permafrost stores 1,500 Gt C; Greenland -270 Gt/yr.
GBR lost ~50% coral since 1995; >99% reefs lost at +2°C.
Himalayan glaciers feed 1.9bn; ~0.5%/yr loss; GLOFs increasingly deadly.
Amazon flipped to net carbon source — tipping point looms.
Pakistan 2022 floods (33m displaced, $30bn, 75% more intense per WWA).
Sea level rise ~3.6 mm/yr; Maldives (80% land <1m) + Tuvalu (Falepili Union 2023) at existential risk.
World Bank Groundswell: ~143m internal climate migrants by 2050.
Climate INJUSTICE: LICs least responsible, suffer most.
Mitigation is the only adequate response — adaptation alone cannot suffice.

Memorise this

Verbatim phrases and definitions Edexcel mark schemes credit.

+1.45°C above pre-industrial in 2024 (1st calendar year).
CO₂ ~422 ppm vs 280 ppm pre-industrial.
Arctic sea ice -13%/decade (NSIDC).
GBR -50% coral since 1995; mass bleach 2016/17/20/22/24.
Sea level rise ~3.6 mm/yr accelerating.
Pakistan 2022 floods: 33m displaced, 1,700 deaths, $30bn (75% more intense per WWA).
Maldives 80% land <1m; Tuvalu Falepili Union with Australia 2023.
Groundswell ~143m climate migrants by 2050.
IPCC AR6: 70-90% reefs lost at +1.5°C; >99% at +2°C.
COP28 Loss + Damage Fund: ~$700m pledged.

How it’s examined

Spec 7.2c is examined in Paper 2 Section C (Global issue option) — typically as the Fragile environments + climate change option (40 marks).

Typical 4GE1 Section C question styles for 7.2c:

Define / describe (2-3 marks) — define climate change / greenhouse effect / global warming / fragile environment / sea level rise.
State (3-4 marks) — name effects on environments / on people.
Explain (4-6 marks) — explain WHY a particular fragile environment is at risk (Arctic, reefs, Amazon).
Examine / evaluate (6-8 marks) — examine impacts of a named extreme event (Pakistan 2022); evaluate human vs natural causes.
Synthesis essay (8-10 marks) — discuss climate change as 'fragile environments first, people pay highest price'; evaluate climate injustice.

Mark-scheme keywords examiners credit: climate change, global warming, greenhouse effect, +1.45°C, CO₂ 422 ppm, IPCC AR6, fragile environment, Arctic, sea ice, NSIDC, -13%/decade, albedo, permafrost, methane, Greenland, GRACE, coral bleaching, zooxanthellae, ocean acidification, GBR, sea level rise, 3.6 mm/yr, Maldives, Tuvalu, Falepili Union, Pakistan 2022, World Weather Attribution, 75% more intense, Himalayan glaciers, 1.9 billion, GLOF, Amazon tipping point, Groundswell, 143 million, climate injustice, Loss + Damage Fund, COP28.

A differentiator.* Naming the SPECIFIC FIGURES + the ATTRIBUTION SCIENCE (e.g. WWA's 75% more intense for Pakistan) + the CLIMATE INJUSTICE framing (Pacific Islands <0.03% emissions but existential risk) is what separates Level 4 from Level 3 answers.

Sources: Pearson Edexcel International GCSE Geography (4GE1) Specification — Issue 4, February 2026, spec 7.2c; IPCC Sixth Assessment Report (AR6) — Working Groups I-III (2021-23); NSIDC — Arctic Sea Ice News + Analysis; World Bank Groundswell Report (2021); World Weather Attribution — Pakistan floods 2022 study; Australian Institute of Marine Science (AIMS) — GBR monitoring; Pearson 4GE1 Examiner Reports — Paper 2. Last reviewed 2026-06-03.

Take this whole topic with you

Step-by-step worked examples — Negative effects of climate change on fragile environments and people

Step-by-step solutions to past-paper-style questions on negative effects of climate change on fragile environments and people, written exactly the way a tutor would explain them at the board.

1Defining climate change
Getting started• AO1
Question
Define 'climate change' and 'global warming'. [2]
Step-by-step solution
1. Step 1
  Climate change (1 mark). A LONG-TERM shift in average weather patterns (temperature, rainfall, wind, storms) of a region or the planet. Distinguished from weather, which is short-term.
2. Step 2
  Global warming (1 mark). The MEASURED RISE in Earth's mean surface temperature, mainly since the Industrial Revolution. Currently +1.45°C above pre-industrial in 2024 (the first calendar year above 1.45°C). Caused largely by anthropogenic greenhouse gases (CO₂ ~422 ppm in 2024 vs ~280 ppm pre-industrial).
Answer
Climate change = long-term shift in average weather. Global warming = measured rise in Earth's mean temperature (+1.45°C above pre-industrial in 2024), mainly from human greenhouse gas emissions.
Examiner tip
Mark scheme: 1 mark for each definition. Adding the +1.45°C / 422 ppm figures lifts above the basic 2-mark.
2Fragile environments most at risk
Getting started• AO1
Question
Name THREE fragile environments most at risk from climate change. [3]
Step-by-step solution
1. Step 1
  Arctic + polar regions (1 mark). Arctic sea ice declining ~13%/decade (NSIDC); ice-free summers projected ~2035; permafrost thaw releases methane (e.g. Siberian craters); Greenland ice sheet losing ~270 Gt/yr.
2. Step 2
  Coral reefs (1 mark). Great Barrier Reef has lost ~50% of corals since 1995; mass bleaching events 2016, 2017, 2020, 2022 and 2024. At +1.5°C, IPCC projects 70-90% of coral reefs lost.
3. Step 3
  Low-lying islands + coasts (1 mark). Maldives (~80% of land <1 m above sea level), Tuvalu, Kiribati, Marshall Islands — at existential risk from sea level rise (~3.6 mm/yr and accelerating). Bangladesh delta + Sundarbans similarly vulnerable.
Answer
Three fragile environments: (1) Arctic/polar (sea ice -13%/decade, permafrost thaw); (2) coral reefs (Great Barrier Reef -50% since 1995); (3) low-lying islands + coasts (Maldives 80% land <1m).
Examiner tip
Mark scheme: 1 mark per environment. Naming specific places + figures (Maldives, GBR, Arctic with numbers) is the marker for a Level 3 / A*-track answer.
3Effects on the Arctic
Building confidence• AO1, AO2
Question
Explain how climate change is affecting the ARCTIC environment. Refer to specific evidence. [6]
Step-by-step solution
1. Step 1
  Sea ice loss (2 marks). Arctic sea ice has declined ~13% per decade since 1979 (NSIDC satellite record). September 2024 sea ice was the 6th lowest on record. Ice-free summers projected for the late 2030s (some models say 2035). Albedo effect: dark ocean absorbs more solar radiation than reflective ice → POSITIVE FEEDBACK accelerating Arctic warming. The Arctic is warming 2-4× faster than the global mean ('Arctic amplification').
2. Step 2
  Permafrost thaw (2 marks). Permafrost covers ~25% of Northern Hemisphere land. Thawing releases stored CO₂ + methane (CH₄ is 28× more potent than CO₂ over 100 years). Siberia has seen dramatic methane release including large craters in the Yamal Peninsula (e.g. 2014 Yamal crater). Permafrost thaw destabilises buildings, roads, pipelines across Russia, Canada, Alaska.
3. Step 3
  Ice sheets + glaciers (1 mark). Greenland ice sheet losing ~270 Gt/year (GRACE satellite data). Contributes directly to sea level rise. Glaciers in Svalbard + Alaska retreating rapidly.
4. Step 4
  Ecosystems + Indigenous peoples (1 mark). Polar bears (Ursus maritimus) face habitat loss as sea-ice hunting platforms vanish; population in Hudson Bay subpopulation down ~30% since the 1980s. Indigenous Arctic peoples (Inuit, Sami) face disrupted hunting + traditional lifestyles; thawing infrastructure threatens villages like Newtok, Alaska (relocating since 2019).
Answer
Sea ice -13%/decade (NSIDC); ice-free summers ~2035; albedo positive feedback drives 2-4× faster Arctic warming. Permafrost thaw releases CH₄ (28× CO₂ potency) — Siberian craters in Yamal. Greenland losing ~270 Gt/yr (GRACE). Polar bears down ~30% in Hudson Bay; Inuit + Sami face cultural disruption; Newtok, Alaska being relocated.
Examiner tip
Top-band 6-mark answer needs specific data (-13%/decade, 270 Gt/yr) + named places (Siberia, Yamal, Newtok, Hudson Bay) + the FEEDBACK mechanism (albedo). NSIDC, GRACE references add scientific credibility.
4Coral bleaching mechanism + scale
Building confidence• AO1, AO2
Question
Describe coral BLEACHING and explain why climate change is causing it on the Great Barrier Reef. [6]
Step-by-step solution
1. Step 1
  What is bleaching (2 marks). Corals live in symbiosis with photosynthetic algae called zooxanthellae which give them colour + ~80% of their energy. When sea temperatures rise even 1-2°C above the seasonal maximum, corals expel the zooxanthellae as a stress response, turning white ('bleached'). Bleached corals are not dead but are starving — if temperatures stay high for weeks, they die.
2. Step 2
  Why climate change drives it (2 marks). Oceans have absorbed ~90% of excess heat from anthropogenic warming. Sea surface temperatures (SST) have risen ~1°C since pre-industrial. Warm-water 'marine heatwaves' (>1°C above climatology for 5+ days) are now ~2× more frequent than in the 1980s. Ocean ACIDIFICATION (CO₂ dissolving in seawater forms carbonic acid; ocean pH dropped from 8.21 to 8.10 since 1750) weakens coral skeletons further.
3. Step 3
  Great Barrier Reef evidence (1 mark). The GBR (Australia, ~2,300 km long, world's largest reef system) has suffered MASS BLEACHING in 2016, 2017, 2020, 2022 and 2024 — five mass events in nine years. Estimated ~50% of GBR coral has died since 1995 (Australian Institute of Marine Science). The 2016 event killed ~30% of corals north of Port Douglas.
4. Step 4
  Wider projection (1 mark). IPCC AR6 projects 70-90% of warm-water coral reefs lost at +1.5°C of warming, and >99% at +2°C. With 2024 at +1.45°C, the world is on the edge of catastrophic coral loss.
Answer
Bleaching = corals expel zooxanthellae algae under heat stress (>1-2°C above seasonal max) → white + starving. SST up ~1°C since pre-industrial (oceans absorb ~90% of excess heat); marine heatwaves ~2× more frequent; ocean pH 8.21→8.10 weakens skeletons. GBR: mass bleaching 2016/17/20/22/24, ~50% coral lost since 1995. IPCC AR6: 70-90% reefs lost at +1.5°C, >99% at +2°C.
Examiner tip
Top-band answer needs the MECHANISM (zooxanthellae expulsion), specific GBR years + percentages, and the IPCC threshold figures. Naming AIMS lifts credibility.
5Stretch — Pakistan floods 2022 case study
Stretch• AO2, AO3
Question
To what extent were the PAKISTAN FLOODS of 2022 caused by climate change rather than by physical geography alone? [6]
Step-by-step solution
1. Step 1
  Scale of the disaster (1 mark). Pakistan's 2022 monsoon floods displaced ~33 million people, killed ~1,700, and caused ~$30 billion in damage + economic losses (~10% of GDP). At peak, ~1/3 of the country was underwater. Sindh + Balochistan provinces worst hit.
2. Step 2
  Physical/geographical causes (1 mark). Pakistan's monsoon climate routinely brings heavy rainfall June-September. Indus floodplain is naturally flood-prone — flat, low-lying, fed by glacier-melt + monsoon. Glacier-melt also contributed (record temperatures of >50°C in spring 2022 accelerated melt).
3. Step 3
  Climate-change attribution (2 marks). Pakistan received ~190% above average rainfall in July-August 2022 — one of the wettest monsoons on record. World Weather Attribution (WWA) study: climate change made the 5-day max rainfall in Sindh + Balochistan ~75% more intense. Warmer atmosphere holds ~7% more moisture per +1°C (Clausius-Clapeyron); warmer Indian Ocean + glacier melt amplified rainfall + runoff. Climate change DID NOT cause the monsoon but AMPLIFIED extreme events.
4. Step 4
  Human vulnerability (1 mark). Pakistan contributes <1% of global CO₂ but suffered ~$30bn loss. Poverty, weak flood defences, deforested upper catchments, encroachment on floodplains amplified human impact. Highlights CLIMATE INJUSTICE — low-emitter LICs disproportionately exposed.
5. Step 5
  Judgement (1 mark). Climate change was a major amplifier (~75% more intense rain per WWA) but not the SOLE cause. Physical geography (monsoon + Indus floodplain), poverty, deforestation, weak infrastructure all combined. The 2022 floods are an example of a CLIMATE-CHANGE-AMPLIFIED disaster.
Answer
Pakistan 2022: 33m displaced, 1,700 dead, $30bn loss, 1/3 of country flooded. Physical: monsoon + Indus floodplain + glacier melt at >50°C. Climate change: 190% above average rainfall; WWA says climate change made rainfall ~75% more intense (Clausius-Clapeyron +7% moisture per °C; warmer Indian Ocean). Pakistan contributes <1% global CO₂ → climate injustice. Judgement: climate change AMPLIFIED rather than CAUSED — a textbook climate-amplified disaster.
Examiner tip
AO3 'to what extent' needs BOTH SIDES + judgement. Top-band: cite WWA attribution study (75%), the Clausius-Clapeyron physics, AND the climate-injustice framing. The 'amplified rather than caused' framing is the A* synthesis.
6Stretch — climate migration
Stretch• AO2, AO3
Question
Explain how climate change may force MASS HUMAN MIGRATION by 2050. Refer to specific examples + projections. [6]
Step-by-step solution
1. Step 1
  Scale projection (1 mark). World Bank Groundswell Report (2021) projects ~143 million internal climate migrants by 2050 across sub-Saharan Africa, South Asia + Latin America under high-emissions, low-development scenarios. UNHCR estimates climate-related displacement already exceeds ~30 million/year.
2. Step 2
  Sea level rise pushes islanders (2 marks). Sea level rising ~3.6 mm/yr (accelerating from ~1.4 mm/yr in 1900s, satellite altimetry). Maldives (~80% of land <1 m above sea level) projected to lose most habitable land by 2100. Tuvalu + Kiribati + Marshall Islands could become uninhabitable. New Zealand has a Pacific Access Category visa for Tuvaluans + Kiribati nationals; Australia signed the Falepili Union with Tuvalu (Nov 2023) offering 280 visas/year. The Maldives is buying land overseas + building artificial islands (Hulhumalé reclaimed 2,000+ ha).
3. Step 3
  Drought + food insecurity (2 marks). Sahel + Horn of Africa: prolonged droughts since 2020 have displaced millions in Somalia, Ethiopia, Kenya (~2.1m internally displaced in Somalia 2022 alone). South Asia + Mekong delta: salt intrusion + cyclones force coastal-village relocations. Bangladesh's Sundarbans coast loses ~12 sq km/year; Aila cyclone (2009) displaced ~300,000.
4. Step 4
  Extreme weather + secondary effects (1 mark). Wildfires (Canada 2023 ~18m ha), heatwaves, floods (Pakistan 2022) all force temporary or permanent displacement. Climate is now a 'threat multiplier' to conflict + political instability (Syria's pre-civil-war drought 2007-10).
Answer
World Bank Groundswell: ~143m climate migrants by 2050 in sub-Saharan Africa, South Asia, Latin America. SLR ~3.6 mm/yr accelerating → Maldives (80% land <1m) buying overseas land + building Hulhumalé; Tuvalu Falepili Union with Australia (2023, 280 visas/yr); Kiribati + Marshall Islands at risk. Sahel drought displaced 2.1m in Somalia 2022. Bangladesh Sundarbans loses 12 km²/yr; Aila cyclone 2009 displaced 300,000. Wildfires + heatwaves add temporary displacement. Climate is a 'threat multiplier'.
Examiner tip
Top-band 6-mark answer needs (1) Groundswell figure, (2) sea-level rise mechanism + island examples, (3) drought/Sahel/Bangladesh, (4) policy responses (Falepili Union). The '143m by 2050' figure is high-value.

Model Answers — Negative effects of climate change on fragile environments and people

High-scoring sample answers for negative effects of climate change on fragile environments and people on the Cambridge IGCSE paper, with examiner-style notes mapping each response to the mark scheme and assessment objectives.

Question 1
2 marks
[EASY] Define the 'greenhouse effect'. [2]
Model answer
The greenhouse effect is the natural process by which certain gases in Earth's atmosphere (mainly CO₂, methane, water vapour, nitrous oxide) trap outgoing infrared radiation from Earth's surface, keeping the planet warmer than it would otherwise be (about +33°C warmer overall).

The enhanced greenhouse effect is the additional warming caused by HUMAN emissions of greenhouse gases since the Industrial Revolution (CO₂ from ~280 ppm pre-industrial to ~422 ppm in 2024), which has raised global mean temperature by ~+1.45°C.
Why this scores
Mark scheme: 1 mark for trapping outgoing infrared / longwave radiation; 1 mark for naming gases or distinguishing natural from enhanced effect.
Question 2
3 marks
[EASY] State THREE negative effects of climate change on the natural environment. [3]
Model answer
Arctic sea ice loss — declining ~13% per decade (NSIDC), with ice-free summers projected by ~2035 and severe impacts on polar species (polar bears, walruses).

Coral bleaching — Great Barrier Reef has suffered mass bleaching in 2016, 2017, 2020, 2022 and 2024; ~50% of GBR coral lost since 1995.

Glacier retreat + permafrost thaw — Himalayan glaciers shrinking ~0.5%/year, affecting water supply for ~1.9 billion downstream; Siberian permafrost releasing methane (28× CO₂ potency).
Why this scores
Mark scheme: 1 mark per environment + brief specific evidence. Top answers always name a specific place + a figure.
Question 3
4 marks
[MEDIUM] Explain TWO ways climate change is negatively affecting PEOPLE. Use named examples. [4]
Model answer
1) Extreme weather events damage lives + livelihoods. Climate change is amplifying floods, heatwaves, droughts + wildfires.

Pakistan floods 2022 — ~33 million displaced, ~1,700 deaths, ~$30 billion damage (10% of GDP). The World Weather Attribution study found climate change made the 5-day extreme rainfall ~75% more intense than it would otherwise have been.

Europe heatwave 2022 — ~60,000 excess deaths across Europe (mostly elderly), agricultural losses, wildfires.

Canada wildfires 2023 — ~18 million hectares burned (largest area on record), tens of thousands evacuated, smoke pollution reached the US east coast and Europe.

2) Sea level rise threatens coastal homes + livelihoods. Global sea level is rising ~3.6 mm/year (and accelerating from ~1.4 mm/year in the 1900s).

Maldives — ~80% of land <1 m above sea level; building artificial islands (Hulhumalé, 2,000+ ha reclaimed) and considering buying land overseas.

Tuvalu — signed the Falepili Union with Australia (Nov 2023), giving 280 Tuvaluans/year visas as climate-related relocation begins.

Bangladesh / Sundarbans — losing ~12 km² of coast per year; salt intrusion ruins farmland; cyclones like Aila (2009) displaced ~300,000.

World Bank's Groundswell Report projects up to ~143 million internal climate migrants across sub-Saharan Africa, South Asia + Latin America by 2050 if emissions stay high.
Why this scores
Mark scheme: 1 mark for each impact named (×2) + 1 mark for a specific example (×2). Naming WWA attribution study + Groundswell figure lifts to top of band.
Question 4
4 marks
[MEDIUM] Explain why GLACIER RETREAT in the Himalayas threatens both environments + people. [4]
Model answer
The scale of retreat. Himalayan glaciers are shrinking by ~0.5% of mass per year on average since 2000, according to ICIMOD + the IPCC AR6. The Hindu Kush Himalaya region has lost an estimated ~40% of glacier ice since the Little Ice Age. By 2100, ICIMOD projects 30-50% of remaining ice could be lost even with 1.5°C warming, and 75% lost at +2°C.

Environmental impact.

Alpine meadows + mountain ecosystems shifted upslope as temperatures rise.

Black-carbon deposition (from South Asian air pollution) darkens snow surface, accelerating melt by reducing albedo.

Glacial lakes form behind retreating ice (e.g. Imja Tsho, Nepal) — at risk of GLOFs (glacial lake outburst floods).

Human impact.

The Himalayan + Karakoram glaciers feed 10 major rivers (Indus, Ganges, Brahmaputra, Yangtze, Mekong, etc.) that supply water to ~1.9 billion people across Pakistan, India, Bangladesh, Nepal, Bhutan, China + SE Asia.

Short term: glacier-melt + monsoons combined = INCREASED flood risk (e.g. Pakistan 2022 amplified by record glacier melt during 50°C+ spring).

Long term: as glaciers shrink, dry-season flow declines → water + agricultural stress for ~1.9bn people.

GLOFs threaten downstream communities. The 2023 Sikkim, India GLOF killed ~80 people; 2021 Chamoli Uttarakhand glacier collapse killed ~200.

Hydroelectric power output may decline as glacier-fed flows reduce.

This is why Himalayan glacier retreat is one of the most consequential climate impacts globally.
Why this scores
Mark scheme: 1 mark for retreat rate; 1 mark for the 1.9bn downstream figure; 1 mark for an example (GLOF, Indus, hydropower); 1 mark for linking environmental + human impacts. Naming ICIMOD lifts credibility.
Question 5
4GE1 Paper 2 Section C style (AO1/AO2/AO3)6 marks
[HARD] Discuss the evidence that the AMAZON RAINFOREST is approaching a CLIMATE TIPPING POINT, and explain why this matters globally. [6]
Model answer
What the Amazon tipping point means. Scientists (e.g. Carlos Nobre, Tom Lovejoy) warn the Amazon may be approaching a point where deforestation + warming push the rainforest into a SELF-REINFORCING transition to savanna. Past ~20-25% deforestation (~17% reached by 2024), the rainforest's own rainfall-recycling system collapses + the forest dies back.

Evidence the tipping point is approaching.

Amazon flipped to a carbon SOURCE. A landmark 2021 Nature study (Gatti et al.) showed eastern Amazon now emits more CO₂ than it absorbs, driven by deforestation + fires.

Drought + dry-season intensification. Severe Amazon droughts in 2005, 2010, 2015-16, 2023. The 2023 Amazon drought saw river levels at Manaus the lowest in 121 years of records.

Deforestation. ~17% of original Amazon already cleared. Under Bolsonaro (2019-22), Brazilian Amazon deforestation rose 60%. Under Lula (2023-), it dropped ~50% in Brazil but remains high in Bolivia + Peru.

Fires. Record fires across 2019, 2020, 2021, 2023. Many are set deliberately for cattle + soy.

Forest is drying. Eastern Amazon dry-season has lengthened by ~3-4 weeks since 1979.

Why this matters globally.

Carbon storage. The Amazon stores ~150-200 billion tonnes of carbon (~10 years of current global emissions). Releasing this would raise atmospheric CO₂ by ~50 ppm.

Rainfall recycling. The Amazon recycles ~50% of its own rainfall + drives the 'flying rivers' that water southern Brazil's agriculture + La Plata basin (cities + farmland).

Biodiversity. The Amazon holds ~10% of the world's species — collapse would be a mass extinction.

Climate feedback. Forest → savanna shift creates a POSITIVE FEEDBACK that accelerates further warming.

Indigenous peoples. ~400 indigenous groups depend on the Amazon.

Judgement. The Amazon is the most studied climate tipping element + the closest to its threshold. Brazilian government policy is therefore not just a national issue but a planetary one. Lula's 50% deforestation reduction in 2023 is encouraging, but the long-term trend + droughts indicate the system is still under stress. Crossing the tipping point would lock in catastrophic, irreversible change at the global scale.
Why this scores
Top-band 6-mark answer needs (1) explanation of tipping-point mechanism, (2) multi-line evidence (carbon source flip, droughts, deforestation %, fires, dry-season), (3) GLOBAL CONSEQUENCES (carbon stored, biodiversity, rainfall recycling), (4) judgement. Naming Gatti 2021 + Manaus 121-year record lifts to A*.
Question 6
6 marks
[HARD] Explain the POSITIVE FEEDBACK loops that make Arctic climate change so dangerous. Refer to specific evidence. [6]
Model answer
Climate scientists describe FEEDBACK LOOPS as processes that AMPLIFY (positive feedback) or DAMPEN (negative feedback) initial warming. The Arctic is the textbook example of multiple, interacting positive feedbacks.

1) Sea-ice / albedo feedback.

Sea ice + snow reflect ~80-90% of incoming solar radiation back to space (high albedo).

As ice melts, dark open ocean (albedo ~6%) is exposed and absorbs ~94% of incoming radiation.

This warms the ocean further, which melts more ice — POSITIVE FEEDBACK.

Evidence: Arctic sea ice declining ~13%/decade (NSIDC); Arctic is warming 2-4× faster than the global mean ('Arctic amplification').

2) Permafrost / methane feedback.

~25% of Northern Hemisphere land is permafrost (Russia, Canada, Alaska, Greenland).

It stores ~1,500 billion tonnes of carbon (~2× atmospheric carbon today).

As permafrost thaws, microbes break down ancient organic matter releasing CO₂ and especially METHANE (CH₄, 28× CO₂ warming potential over 100 years).

Released methane warms further → more thaw → more release. POSITIVE FEEDBACK.

Evidence: Siberian methane craters (e.g. 2014 Yamal crater, 30 m wide); subsea Arctic methane plumes documented in the Laptev + East Siberian seas.

3) Greenland ice-sheet feedback.

Greenland is losing ~270 Gt/year (GRACE satellite). As ice-sheet surface lowers, it warms (lapse rate); meltwater darkens surface; ice-bed lubrication accelerates flow.

Direct contribution to sea level rise (~0.7 mm/yr from Greenland alone).

4) Boreal forest / tundra fires feedback.

Record Siberian + Canadian wildfires (Canada 2023 ~18 million ha burned) release stored carbon and reduce future albedo + carbon-sink capacity.

5) Ocean circulation impact (less certain).

Greenland meltwater could weaken the Atlantic Meridional Overturning Circulation (AMOC), with major climate consequences for Europe (cooling) + Africa (monsoon disruption). Recent observations suggest AMOC has weakened ~15% since the mid-20th century (Caesar et al. 2018).

Why this is so dangerous. Each feedback amplifies the others. Once tipped, the system runs without further human input. The IPCC, in AR6 (2021), formally identifies the Arctic as one of the highest-risk regions because of these compound positive feedbacks. Limiting warming to 1.5°C dramatically reduces (but does not eliminate) the risk of cascading Arctic tipping points.
Why this scores
Top-band answer needs the MECHANISM of feedback explained for at least 2-3 loops, specific evidence (NSIDC -13%, GRACE 270 Gt, Yamal crater), the 'Arctic amplification 2-4×' figure, and clear understanding that compound feedbacks make the Arctic uniquely dangerous. Naming AR6, AMOC, Caesar 2018 lifts to A*.
Question 7
4GE1 Paper 2 Section C style (AO2/AO3)8 marks
[CHALLENGE] Compare the impacts of climate change on TWO contrasting fragile environments (one POLAR/cold, one TROPICAL/warm). What does the comparison reveal about how climate change affects different ecosystems? [8]
Model answer
Climate change affects EVERY ecosystem but its impacts manifest differently in polar vs tropical environments. Comparing the Arctic + coral reefs reveals both common drivers + distinctive vulnerabilities.

ARCTIC (cold-environment case).

Direct evidence of impact.

Sea ice declining ~13%/decade (NSIDC, since 1979 satellite record).

Ice-free summer projected by ~2035 (some models earlier).

Arctic warming 2-4× faster than global mean ('Arctic amplification').

Permafrost thaw releasing methane (Siberian craters, Yamal Peninsula).

Greenland ice sheet losing ~270 Gt/year (GRACE).

Polar bear Hudson Bay subpopulation down ~30% since 1980s.

Inuit + Sami communities face cultural disruption; Newtok, Alaska being relocated since 2019.

Mechanism. Albedo feedback (dark ocean replaces reflective ice); permafrost feedback (methane release); ice-sheet collapse.

CORAL REEFS — Great Barrier Reef (warm-environment case).

Direct evidence of impact.

~50% of GBR coral lost since 1995 (AIMS).

Mass bleaching events 2016, 2017, 2020, 2022, 2024 (5 in 9 years).

Sea surface temperatures +1°C since pre-industrial.

Ocean pH dropped from 8.21 to 8.10 (ocean acidification weakens coral skeletons).

IPCC AR6: 70-90% of warm-water reefs lost at +1.5°C; >99% at +2°C.

Mechanism. Bleaching from heat stress (corals expel symbiotic zooxanthellae algae at >1-2°C above seasonal max); ocean acidification weakens calcium-carbonate skeletons; coral cover loss collapses food web.

COMPARISON — SIMILARITIES.

Both are warming faster than global average. Arctic at 2-4×, ocean has absorbed ~90% of excess heat; coral reefs feel that warming directly.

Both face existential threat. Arctic summer ice may be lost ~2035; warm-water corals may be lost >99% at +2°C.

Both are tipping points — once lost, recovery on human timescales is unlikely.

Both have downstream consequences beyond their own boundaries: Arctic feedbacks accelerate global warming; coral loss removes coastal protection + fisheries for ~500 million people.

Both highlight INDIGENOUS + LIC injustice — Inuit + Pacific Islander communities + indigenous peoples reliant on reef fisheries contributed least to climate change but suffer most.

COMPARISON — DIFFERENCES.

Mechanism is different. Arctic = physical ice melt + biogeochemical feedbacks. Reefs = biological stress response (bleaching) + ocean chemistry change.

Geographic scale. Arctic is regional (~6% of Earth's surface); reefs are scattered but cover only ~0.1% of ocean area despite hosting ~25% of marine species.

Reversibility. Arctic sea ice can reform in a cold year; once corals die + reef structure collapses, recovery takes centuries even in best-case scenarios.

Visibility + emotional appeal. Polar bears are charismatic megafauna; corals are less visible but the entire ecosystem collapse is more immediate.

Direct human dependence. Reefs directly support fishing + tourism for hundreds of millions; Arctic supports a smaller direct-use population (~4 million) but indirectly affects everyone via climate feedbacks.

WHAT THE COMPARISON REVEALS.

No ecosystem is safe. From poles to tropics, climate change is destabilising specialised, slowly-adapted ecosystems faster than they can evolve. Generalist species adapt; specialists die.

Feedbacks vary but consequences amplify. Arctic albedo feedback warms the planet; coral reef collapse cascades through marine food webs.

Indigenous + LIC peoples bear the cost. Communities least responsible for emissions face cultural + economic collapse first.

The window for action is narrow. Both ecosystems are at thresholds at +1.5-2°C. Cutting emissions urgently is the only intervention that addresses root cause.

Adaptation is limited. You cannot 'adapt' a coral reef or polar ice. The only meaningful response is MITIGATION.

Conclusion. Comparing Arctic + coral reefs reveals that climate change is not a uniform threat but a multi-mechanism assault that exploits the SPECIFIC VULNERABILITIES of each fragile environment. The shared lesson — that highly-specialised systems collapse under rapid change — is one of the most powerful arguments for keeping warming to 1.5°C.
Why this scores
8-mark CHALLENGE answer needs (1) detailed treatment of BOTH cases with figures, (2) explicit similarities AND differences, (3) higher-level synthesis (no ecosystem is safe; mitigation is the only meaningful response; climate justice). Naming IPCC AR6, AIMS, NSIDC + the +1.5°C/+2°C thresholds lifts to A*.
Question 8
4GE1 Paper 2 Section C style (AO3 synthesis)10 marks
[EXTENDED] 'Climate change affects FRAGILE ENVIRONMENTS first, but ultimately people pay the highest price.' Discuss this statement with reference to specific examples. [10]
Model answer
Climate change is rewriting the physical environment of Earth — but the deepest cost falls on PEOPLE, especially those least responsible for emissions. The statement captures a moral + geographical truth: while the Arctic, coral reefs + glaciers feel impacts first, the cascading consequences (sea level rise, drought, food insecurity, migration) ultimately devastate human societies. This essay examines both halves of the statement + the relationship between them.

Part 1: Fragile environments feel impact FIRST.

Fragile environments are specialised, slowly-adapted ecosystems with narrow tolerance ranges. Multiple lines of evidence show they are responding to climate change before broader human systems:

Arctic sea ice down ~13%/decade since 1979 (NSIDC). Arctic warming 2-4× faster than global mean. Ice-free summer projected ~2035.

Great Barrier Reef has lost ~50% of corals since 1995 (AIMS). Mass bleaching in 2016, 2017, 2020, 2022, 2024.

Himalayan glaciers shrinking ~0.5% mass/year; potentially 30-50% gone by 2100 even at +1.5°C.

Amazon flipped to carbon SOURCE in eastern regions (Gatti et al., 2021 Nature).

Permafrost thawing across Siberia — Yamal craters release stored methane.

Greenland losing ~270 Gt/year (GRACE) and Antarctica's Thwaites Glacier ('Doomsday Glacier') accelerating.

These are physical changes happening NOW, ahead of broader societal disruption. Polar bears, coral, alpine species + permafrost-adapted ecosystems are being lost first because they have no escape.

Part 2: People pay the HIGHEST PRICE.

The cascading consequences of environmental change land on people — disproportionately on poorer + lower-emitting populations.

Extreme weather kills + impoverishes.

Pakistan floods 2022: ~33m displaced, ~1,700 dead, ~$30bn loss (~10% GDP). World Weather Attribution: climate change made it ~75% more intense.

European heatwave 2022: ~60,000 excess deaths (mainly elderly).

Canada wildfires 2023: 18m ha burned; smoke crossed Atlantic to Europe.

Hurricane Otis (Acapulco 2023): $16bn loss; rapidly intensifying due to warm sea surface.

Sea level rise forces relocation + loss of homeland.

SLR ~3.6 mm/yr accelerating (satellite altimetry).

Maldives (80% land <1m): building Hulhumalé (2,000+ ha reclaimed); considering buying overseas land.

Tuvalu: Falepili Union with Australia (Nov 2023, 280 visas/yr) — first formal 'climate migration treaty'.

Kiribati + Marshall Islands at existential risk.

Bangladesh / Sundarbans: loses ~12 km²/yr; cyclone Aila (2009) displaced 300,000.

Food + water security undermined.

Himalayan glacier retreat affects ~1.9 billion downstream (Indus, Ganges, Brahmaputra, Yangtze, Mekong basins).

Sahel drought displaced ~2.1m in Somalia alone in 2022.

Coral reef collapse removes ~500m people's protein source.

Heat stress reduces agricultural yields (every +1°C cuts wheat yields ~6%).

Mass migration.

World Bank Groundswell Report (2021): up to ~143 million internal climate migrants by 2050 across sub-Saharan Africa, South Asia + Latin America under high-emissions, low-development scenarios.

Already ~30m+ climate-related displacements per year.

Public health.

Heat-related deaths up; vector-borne diseases (malaria, dengue) expanding range as mosquito habitat warms.

Air pollution from wildfires kills + sickens; smoke-related health crises in 2023 across N America, Europe.

Cultural + indigenous loss.

Inuit, Sami, Pacific Islanders, Sundarbans Tiger Reserve communities, Bolivian Aymara at Lake Titicaca all face existential cultural threats.

'Loss + damage' goes beyond economics to identity + spiritual loss.

Climate INJUSTICE.

Pakistan contributes <1% global CO₂; suffered $30bn in 2022 floods.

Africa contributes ~4% global CO₂; bears worst Sahel impacts.

Pacific Islands collectively contribute <0.03% global CO₂; face existential threat.

HICs (USA, EU, UK, China) responsible for most historic emissions; LICs pay the price.

COP28 (2023) Loss + Damage Fund pledged ~ $700m — vs estimated need of$ 400bn/year.

Part 3: The RELATIONSHIP between environment + people.

The two halves are causally + morally connected.

Environment first → people later, BUT FASTER over time. Initially fragile environments absorb the shock (Arctic, reefs, glaciers). Then physical changes cascade into human systems (sea level, drought, food, migration).

Some environmental impacts ARE human impacts. Glacier retreat = water for 1.9bn people. Reef loss = fishing + tourism livelihoods. The two are inseparable.

Compound + non-linear. Climate impacts interact (drought + heatwave + fires; melt + monsoon + flood). The full price on people may dwarf early environmental losses.

Wealth + power buffer impacts. HICs cope better via insurance, infrastructure, adaptation funding. LICs cannot. So the moral price IS highest on those least able to bear it.

Counter-arguments + qualifications.

Environment is people. The statement implicitly separates 'environment' from 'people' — but human survival, culture + economy depend on intact environments. Loss of nature IS loss of human heritage. So 'price on environment' is also 'price on people' (just less visible).

Wealthy people are also at risk. California wildfires, Florida hurricanes, European heatwaves prove climate change is affecting HICs too. The statement that 'people pay the highest price' is true for both global poor + a growing share of global rich.

Adaptation works in some places. Singapore, Netherlands, Dubai are investing in adaptation (sea walls, cooling). Wealth buys time. But this further entrenches climate injustice.

The price is being paid NOW. It is not a future hypothesis — the 2022 floods, 2023 fires, multiple coral bleaching, Tuvalu's Falepili Union all show the price is being paid in real time.

JUDGEMENT.

The statement is broadly TRUE but needs qualification.

Environment IS feeling impact first — Arctic + reefs are textbook canaries in the coal mine.

People ARE paying the highest price — measured in deaths, displacement, suffering, cultural loss.

The two are CONNECTED — environmental damage IS human damage.

The HIGHEST price falls on those LEAST RESPONSIBLE — the moral case for climate justice + reparations is unanswerable.

Mitigation (cutting emissions) addresses both causes; adaptation reduces costs but cannot prevent ongoing loss.

Only a rapid, equitable transition to net zero can limit further damage.

Conclusion. The Pakistan floods 2022, Maldives buying overseas land, Hudson Bay polar bears, Mappleton glaciers — these are the same story told from different angles. Climate change reveals the fundamental geography of inequality: environments + people are interconnected; impacts cascade; cost falls on those least responsible. Acting to limit warming to 1.5°C is therefore not just an environmental issue but the deepest moral question of our generation. The statement is right — but the right response is not just to recognise the price, but to refuse to keep paying it.
Why this scores
10-mark EXTENDED essay needs (1) BOTH halves of statement supported with specific evidence + figures, (2) recognition of relationship between environment + people (not separable), (3) climate INJUSTICE framing (Pakistan <1% CO₂ but $30bn cost; Pacific Islands <0.03% CO₂), (4) explicit judgement, (5) examples from EVERY scale (Arctic, reefs, glaciers, floods, SLR, migration, public health). Naming WWA, Groundswell, AIMS, NSIDC, GRACE + the COP28 L+D fund figure lifts to A*.

Key Definitions and Keywords — Negative effects of climate change on fragile environments and people

Definitions to memorise and the exact keywords mark schemes credit for negative effects of climate change on fragile environments and people answers — sharpened from recent examiner reports for the 2026 Cambridge IGCSE sitting.

Climate change
Examiner keyword
A long-term shift in average weather patterns of a region or the planet, mainly caused by human emissions of greenhouse gases since the Industrial Revolution.
Global warming
Examiner keyword
The measured rise in Earth's mean surface temperature; currently +1.45°C above pre-industrial (2024 calendar year).
Greenhouse effect
Examiner keyword
Natural trapping of outgoing infrared radiation by atmospheric gases (CO₂, CH₄, H₂O, N₂O); the enhanced effect is the additional warming from human emissions.
Fragile environment
An ecosystem or region with low ability to absorb disturbance and recover (e.g. Arctic, coral reefs, tropical rainforest, low-lying islands).
Positive feedback loop
Examiner keyword
A process where an initial change is AMPLIFIED by its own consequences (e.g. Arctic albedo loss; permafrost methane release).
Tipping point
A threshold beyond which a small change triggers a rapid + irreversible shift to a new state (e.g. Amazon savannification; ice-sheet collapse).
Albedo
The fraction of solar radiation reflected by a surface. Ice = ~80-90% (high); open ocean = ~6% (low).
Permafrost
Permanently frozen ground (≥2 yrs) covering ~25% of Northern Hemisphere land; stores ~1,500 Gt of carbon; releases CO₂ + CH₄ when it thaws.
Coral bleaching
Examiner keyword
Stress response in which corals expel their symbiotic zooxanthellae algae at high sea temperatures (>1-2°C above seasonal max), turning white and risking death.
Ocean acidification
Drop in seawater pH (8.21 pre-industrial → 8.10 today) as oceans absorb CO₂; weakens calcium-carbonate skeletons of corals + shellfish.
Sea level rise
Examiner keyword
Rising global mean sea level from thermal expansion + melting land ice; currently ~3.6 mm/year and accelerating.
Climate migrant
A person who relocates wholly or partly because of climate-change impacts (sea level rise, drought, extreme weather).
Climate (in)justice
The principle that LICs + low-emitting populations suffer disproportionately from climate impacts caused mainly by HICs.
Attribution science
Statistical science (e.g. World Weather Attribution) that quantifies how much climate change has amplified a specific extreme-weather event.

Common Mistakes and Misconceptions — Negative effects of climate change on fragile environments and people

The traps other students keep falling into on negative effects of climate change on fragile environments and people questions — taken from recent Cambridge IGCSE examiner reports and mark schemes — and how to avoid them.

✕Confusing 'weather' (short-term) with 'climate' (long-term)
Pearson 4GE1 Examiner Reports — Paper 2
Why it happens
Both terms used loosely in everyday speech.
How to avoid it
Climate = average over decades. Weather = day-to-day. A single hot day is not 'climate change'; a 10-year trend is.
✕Vague answers without figures (e.g. 'lots of polar ice melting')
Pearson 4GE1 Examiner Reports — Paper 2
Why it happens
Students remember the concept but not the data.
How to avoid it
Memorise key figures: +1.45°C 2024; 422 ppm; sea ice -13%/decade; SLR 3.6 mm/yr; GBR -50% since 1995; Pakistan $30bn 2022; Groundswell 143m by 2050.
✕Mixing up CAUSES and EFFECTS of climate change
Pearson 4GE1 Examiner Reports — Paper 2
Why it happens
Questions ask one but answers slip into the other.
How to avoid it
READ THE QUESTION. 'Effects' = sea level rise, bleaching, migration. 'Causes' = CO₂ from fossil fuels, deforestation, methane.
✕Generic answers with no named examples
Pearson 4GE1 Examiner Reports — Paper 2
Why it happens
Students learn concepts but not real-world cases.
How to avoid it
Always name a specific place + a specific figure. 'Maldives 80% land <1m'; 'Pakistan 2022 floods $30bn'; 'GBR lost 50% since 1995'.
✕Forgetting positive-feedback loops
Pearson 4GE1 Examiner Reports — Paper 2
Why it happens
Students see climate change as linear cause-effect.
How to avoid it
For top-band answers, explain at least one POSITIVE FEEDBACK loop — Arctic albedo, permafrost methane, Amazon dieback. Feedback explains why warming is non-linear.
✕Missing the climate-INJUSTICE dimension
Pearson 4GE1 Examiner Reports — Paper 2
Why it happens
Climate change framed as an environmental issue only.
How to avoid it
Note that LICs (Pakistan <1% CO₂; Pacific Islands <0.03%) suffer worst impacts. This earns AO3 evaluation marks in 8/10-mark essays.

Negative effects of climate change on fragile environments and people — Pearson Edexcel International GCSE Geography (4GE1) Study Notes (spec 7.2c)

Climate change is rewriting the physical environment of Earth — but the deepest cost falls on PEOPLE, especially those least responsible for emissions. The statement captures a moral + geographical truth: while the Arctic, coral reefs + glaciers feel impacts first, the cascading consequences (sea level rise, drought, food insecurity, migration) ultimately devastate human societies. This essay examines both halves of the statement + the relationship between them.

Part 1: Fragile environments feel impact FIRST.

Fragile environments are specialised, slowly-adapted ecosystems with narrow tolerance ranges. Multiple lines of evidence show they are responding to climate change before broader human systems:

Arctic sea ice down ~13%/decade since 1979 (NSIDC). Arctic warming 2-4× faster than global mean. Ice-free summer projected ~2035.
Great Barrier Reef has lost ~50% of corals since 1995 (AIMS). Mass bleaching in 2016, 2017, 2020, 2022, 2024.
Himalayan glaciers shrinking ~0.5% mass/year; potentially 30-50% gone by 2100 even at +1.5°C.
Amazon flipped to carbon SOURCE in eastern regions (Gatti et al., 2021 Nature).
Permafrost thawing across Siberia — Yamal craters release stored methane.
Greenland losing ~270 Gt/year (GRACE) and Antarctica's Thwaites Glacier ('Doomsday Glacier') accelerating.

These are physical changes happening NOW, ahead of broader societal disruption. Polar bears, coral, alpine species + permafrost-adapted ecosystems are being lost first because they have no escape.

Part 2: People pay the HIGHEST PRICE.

The cascading consequences of environmental change land on people — disproportionately on poorer + lower-emitting populations.

Extreme weather kills + impoverishes.
- Pakistan floods 2022: ~33m displaced, ~1,700 dead, ~$30bn loss (~10% GDP). World Weather Attribution: climate change made it ~75% more intense.
- European heatwave 2022: ~60,000 excess deaths (mainly elderly).
- Canada wildfires 2023: 18m ha burned; smoke crossed Atlantic to Europe.
- Hurricane Otis (Acapulco 2023): $16bn loss; rapidly intensifying due to warm sea surface.
Sea level rise forces relocation + loss of homeland.
- SLR ~3.6 mm/yr accelerating (satellite altimetry).
- Maldives (80% land <1m): building Hulhumalé (2,000+ ha reclaimed); considering buying overseas land.
- Tuvalu: Falepili Union with Australia (Nov 2023, 280 visas/yr) — first formal 'climate migration treaty'.
- Kiribati + Marshall Islands at existential risk.
- Bangladesh / Sundarbans: loses ~12 km²/yr; cyclone Aila (2009) displaced 300,000.
Food + water security undermined.
- Himalayan glacier retreat affects ~1.9 billion downstream (Indus, Ganges, Brahmaputra, Yangtze, Mekong basins).
- Sahel drought displaced ~2.1m in Somalia alone in 2022.
- Coral reef collapse removes ~500m people's protein source.
- Heat stress reduces agricultural yields (every +1°C cuts wheat yields ~6%).
Mass migration.
- World Bank Groundswell Report (2021): up to ~143 million internal climate migrants by 2050 across sub-Saharan Africa, South Asia + Latin America under high-emissions, low-development scenarios.
- Already ~30m+ climate-related displacements per year.
Public health.
- Heat-related deaths up; vector-borne diseases (malaria, dengue) expanding range as mosquito habitat warms.
- Air pollution from wildfires kills + sickens; smoke-related health crises in 2023 across N America, Europe.
Cultural + indigenous loss.
- Inuit, Sami, Pacific Islanders, Sundarbans Tiger Reserve communities, Bolivian Aymara at Lake Titicaca all face existential cultural threats.
- 'Loss + damage' goes beyond economics to identity + spiritual loss.
Climate INJUSTICE.
- Pakistan contributes <1% global CO₂; suffered $30bn in 2022 floods.
- Africa contributes ~4% global CO₂; bears worst Sahel impacts.
- Pacific Islands collectively contribute <0.03% global CO₂; face existential threat.
- HICs (USA, EU, UK, China) responsible for most historic emissions; LICs pay the price.
- COP28 (2023) Loss + Damage Fund pledged ~ $700m — vs estimated need of$ 400bn/year.

Part 3: The RELATIONSHIP between environment + people.

The two halves are causally + morally connected.

Environment first → people later, BUT FASTER over time. Initially fragile environments absorb the shock (Arctic, reefs, glaciers). Then physical changes cascade into human systems (sea level, drought, food, migration).
Some environmental impacts ARE human impacts. Glacier retreat = water for 1.9bn people. Reef loss = fishing + tourism livelihoods. The two are inseparable.
Compound + non-linear. Climate impacts interact (drought + heatwave + fires; melt + monsoon + flood). The full price on people may dwarf early environmental losses.
Wealth + power buffer impacts. HICs cope better via insurance, infrastructure, adaptation funding. LICs cannot. So the moral price IS highest on those least able to bear it.

Counter-arguments + qualifications.

Environment is people. The statement implicitly separates 'environment' from 'people' — but human survival, culture + economy depend on intact environments. Loss of nature IS loss of human heritage. So 'price on environment' is also 'price on people' (just less visible).
Wealthy people are also at risk. California wildfires, Florida hurricanes, European heatwaves prove climate change is affecting HICs too. The statement that 'people pay the highest price' is true for both global poor + a growing share of global rich.
Adaptation works in some places. Singapore, Netherlands, Dubai are investing in adaptation (sea walls, cooling). Wealth buys time. But this further entrenches climate injustice.
The price is being paid NOW. It is not a future hypothesis — the 2022 floods, 2023 fires, multiple coral bleaching, Tuvalu's Falepili Union all show the price is being paid in real time.

JUDGEMENT.

The statement is broadly TRUE but needs qualification.

Environment IS feeling impact first — Arctic + reefs are textbook canaries in the coal mine.
People ARE paying the highest price — measured in deaths, displacement, suffering, cultural loss.
The two are CONNECTED — environmental damage IS human damage.
The HIGHEST price falls on those LEAST RESPONSIBLE — the moral case for climate justice + reparations is unanswerable.
Mitigation (cutting emissions) addresses both causes; adaptation reduces costs but cannot prevent ongoing loss.
Only a rapid, equitable transition to net zero can limit further damage.

Conclusion. The Pakistan floods 2022, Maldives buying overseas land, Hudson Bay polar bears, Mappleton glaciers — these are the same story told from different angles. Climate change reveals the fundamental geography of inequality: environments + people are interconnected; impacts cascade; cost falls on those least responsible. Acting to limit warming to 1.5°C is therefore not just an environmental issue but the deepest moral question of our generation. The statement is right — but the right response is not just to recognise the price, but to refuse to keep paying it.

Negative effects of climate change on fragile environments and people

Detailed Study Notes

At a glance

What you’ll learn

Quick recap

Memorise this

How it’s examined

Take this whole topic with you

1Defining climate change

2Fragile environments most at risk

3Effects on the Arctic

4Coral bleaching mechanism + scale

5Stretch — Pakistan floods 2022 case study

6Stretch — climate migration

Climate change

Global warming

Greenhouse effect

Fragile environment

Positive feedback loop

Tipping point

Albedo

Permafrost

Coral bleaching

Ocean acidification

Sea level rise

Climate migrant

Climate (in)justice

Attribution science

✕Confusing 'weather' (short-term) with 'climate' (long-term)

✕Vague answers without figures (e.g. 'lots of polar ice melting')

✕Mixing up CAUSES and EFFECTS of climate change

✕Generic answers with no named examples

✕Forgetting positive-feedback loops

✕Missing the climate-INJUSTICE dimension

Negative effects of climate change on fragile environments and people

Detailed Study Notes

At a glance

What you’ll learn

Quick recap

Memorise this

How it’s examined

Take this whole topic with you

1Defining climate change

2Fragile environments most at risk

3Effects on the Arctic

4Coral bleaching mechanism + scale

5Stretch — Pakistan floods 2022 case study

6Stretch — climate migration

Climate change

Global warming

Greenhouse effect

Fragile environment

Positive feedback loop

Tipping point

Albedo

Permafrost

Coral bleaching

Ocean acidification

Sea level rise