Fracking

Question

Step-by-step solution

1. Step 1

   A well is drilled vertically down to the shale rock layer (which may be 1–3 km underground), then horizontally through the shale formation — this is called directional drilling.

2. Step 2

   A high-pressure mixture of water, sand and chemicals (fracking fluid) is pumped into the borehole. The enormous pressure fractures (cracks) the shale rock, creating pathways through which trapped natural gas and oil can flow.

3. Step 3

   The sand particles (proppants) hold the fractures open after the pressure is released. The released gas and oil flow up the well to the surface where they are collected.

4. Step 4

   Difference from conventional extraction: conventional gas is found in porous rock formations where it migrates naturally and can be extracted with standard drilling. Shale gas is trapped in impermeable rock and cannot flow without artificial fracturing — hence the need for fracking.

Question

Step-by-step solution

1. Step 1

   Energy supply / energy security — fracking unlocks large reserves of shale gas that were previously inaccessible. Countries with shale deposits can reduce dependence on imported fossil fuels, improving energy independence (e.g. the USA became a net energy exporter partly due to the shale gas revolution).

2. Step 2

   Lower energy prices — increased domestic supply of natural gas can lower fuel prices for consumers and industry. This has economic benefits for households and manufacturing competitiveness.

3. Step 3

   Transitional fuel / lower carbon than coal — natural gas produces approximately 50% less CO₂ per unit of energy than coal when burned. Some argue that switching power stations from coal to shale gas can reduce carbon emissions in the short term while renewable capacity is built.

Question

Step-by-step solution

1. Step 1

   Disadvantage — water contamination: fracking fluid can leak into groundwater aquifers, contaminating drinking water supplies with methane and toxic chemicals. In the USA, flammable tap water has been documented near fracking sites. This poses serious public health risks.

2. Step 2

   Disadvantage — water use: a single fracking well can use 10–30 million litres of water. In water-stressed regions this competes with agricultural and domestic supply — a major concern for LICs.

3. Step 3

   Disadvantage — seismic activity (earthquakes): injecting large volumes of fluid underground and disposing of wastewater in injection wells increases pressure on fault lines, triggering minor earthquakes. Several have been recorded near fracking sites in the UK (e.g. Lancashire, 2019).

4. Step 4

   Disadvantage — methane leaks (fugitive emissions): methane is a potent greenhouse gas (~80× more warming than CO₂ over 20 years). Leaks from wells and pipelines can erode any carbon advantage over coal.

5. Step 5

   Advantage — lower CO₂ than coal: if shale gas replaces coal in power generation and methane leaks are controlled, it produces ~50% less CO₂. This is a short-term climate benefit during the energy transition.

6. Step 6

   Conclusion: the environmental risks of fracking — water contamination, seismic activity, and fugitive methane — are significant and difficult to fully control. The short-term benefit of lower CO₂ over coal is real but undermined by methane leakage. Many environmental scientists argue investment would be better directed at renewables. The scale of risk makes fracking controversial and heavily restricted or banned in several countries (e.g. France, Germany).

Question

Step-by-step solution

1. Step 1

   Coal plant: Coal combustion produces the highest CO₂ emissions per unit of electricity of the three options — approximately 820 g CO₂/kWh (compared to ~490 g for gas and <15 g for wind). Coal also produces SO₂ and NOₓ, causing acid rain and respiratory disease. Coal mining causes habitat destruction, land subsidence, and generates large volumes of solid waste. On every environmental metric, coal is the worst option.

2. Step 2

   Shale gas plant (fracking): Produces approximately 490 g CO₂/kWh — significantly less than coal but still a substantial greenhouse gas contribution over a 30-year plant lifetime. The critical factor is fugitive methane: if well integrity fails and methane leaks at rates above ~3% of production, the net greenhouse impact of fracked gas can equal or exceed coal over a 20-year period (because methane is ~80× more potent than CO₂ over that period). Additional risks: groundwater contamination from fracking fluid, induced seismicity, large water use (10–30 million litres per well).

3. Step 3

   Offshore wind farm: Lifecycle emissions are approximately 12–15 g CO₂/kWh — over 95% lower than both fossil options. No fuel combustion, no water use in operation, no chemical contamination risk. Disadvantages: intermittent generation (only generates when wind blows, capacity factor ~40%); requires grid infrastructure upgrades for integration; offshore turbines have higher capital costs and maintenance costs (marine environment); visual and noise impact during construction; some risk to marine wildlife during installation.

4. Step 4

   Recommendation: The offshore wind farm is the clear environmental choice: its lifecycle CO₂ is ~98% lower than coal and ~97% lower than gas; it involves no mining, no chemical injection, no groundwater risk, and no radioactive waste. The intermittency challenge can be managed through grid interconnection and storage. The higher upfront cost is justified by zero fuel costs for the ~25-year operational lifetime, making it increasingly competitive. Unless the country faces a serious immediate energy crisis requiring baseload power overnight with no storage solution, offshore wind is the preferred option.

Question

Step-by-step solution

1. Step 1

   How fracking improves energy security: Energy security requires reliable, affordable energy that is not dependent on potentially hostile foreign suppliers. By developing domestic shale gas: (1) Country Y reduces its 70% import dependency, lowering exposure to supply disruptions caused by geopolitical tensions. (2) Domestic production reduces the foreign exchange cost of energy imports, improving the trade balance. (3) Increased domestic supply creates downward price pressure, making energy more affordable for consumers and industry. (4) Domestic reserves provide a strategic buffer — even if fracking is not fully deployed immediately, proved reserves reassure investors and trading partners.

2. Step 2

   Evaluation — Does energy security justify the environmental risks?

   Arguments FOR (energy security justifies fracking): The immediate risk of supply interruption — with 70% dependence on a single supplier — represents a national security emergency. Energy poverty and economic collapse from supply disruption cause immediate, certain harm. Environmental risks from fracking, while real, can be managed through regulation, monitoring, and best practices. Many countries (USA, Canada, Australia) have successfully managed fracking with relatively contained environmental impacts in carefully selected sites.

   Arguments AGAINST: Environmental contamination of groundwater can make land uninhabitable permanently — the cost may exceed the economic benefit. Short-term energy security achieved by locking in fossil fuel infrastructure for 30+ years worsens long-term climate security. Country Y may be investing billions in an asset that becomes stranded as the global energy transition accelerates. The single-supplier dependency could be addressed more sustainably through other means.

3. Step 3

   Alternative long-term strategy: Country Y should pursue energy diversification through renewables combined with short-term emergency storage and supply diversification. Specifically: (1) Negotiate contracts with multiple gas suppliers immediately to reduce single-supplier risk without building new infrastructure. (2) Invest in domestic solar and wind energy (which cannot be cut off by geopolitics). (3) Develop interconnections with neighbouring electricity grids for resilience. (4) Build strategic gas reserves (storage) to provide buffer during supply disruptions. This approach addresses the immediate security concern while avoiding the environmental risks of fracking and positioning Country Y for a low-carbon future.