What is mitigation?
Big idea: Mitigation = reducing the cause. We try to prevent climate change from getting worse by cutting greenhouse gas emissions.
Mitigation vs adaptation
Mitigation
- Addresses the CAUSE
- Reduces GHG emissions
- Prevents future warming
- Benefits everyone globally
- Requires global cooperation
Adaptation
- Addresses the EFFECTS
- Adjusts to changes already happening
- Reduces vulnerability
- Benefits specific regions/groups
- Can be done locally
Both are needed! Mitigation slows the problem; adaptation helps us cope with changes that are already unavoidable.
Categories of mitigation
- Reducing emissions: Switch to renewables, improve efficiency, change behaviour
- Removing carbon: Afforestation, carbon capture and storage (CCS), direct air capture
- Avoiding emissions: Prevent deforestation, reduce waste, shift diets
Exam tip: The distinguish between mitigation and adaptation question is extremely common. Learn the key differences and be able to give examples of each.
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Specific mitigation strategies
Big idea: Mitigation strategies range from technological solutions (renewables, CCS) to behaviour changes (diet, transport) to policy measures (carbon taxes, regulations).
Energy sector
- Renewable energy: Solar, wind, hydroelectric, geothermal, tidal — zero emissions in operation
- Nuclear power: Low carbon but controversial (waste, safety, cost)
- Energy efficiency: Better insulation, efficient appliances, LED lighting
- Smart grids: Balance supply and demand, reduce waste
Carbon removal and storage
- Afforestation/reforestation: Trees absorb CO₂ through photosynthesis
- Carbon capture and storage (CCS): Capture CO₂ from power plants, store underground
- Direct air capture: Machines that extract CO₂ directly from atmosphere (expensive)
- Soil carbon sequestration: Agricultural practices that store carbon in soil
Other sectors
- Transport: Electric vehicles, public transport, cycling, efficient vehicles
- Agriculture: Reduced meat consumption, improved livestock management, less fertiliser
- Industry: Process efficiency, material recycling, fuel switching
- Buildings: Green building standards, passive heating/cooling
Exam tip: For evaluation questions, consider pros and cons of each strategy: cost, feasibility, time scale, effectiveness, side effects.
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IB-style question — reducing emissions from a city [2]
A growing city has high carbon dioxide emissions from cars and coal-fired power stations.
Outline two mitigation strategies the city could use to reduce its contribution to climate change. [2]
How to answer it, step by step
- Cut the carbon coming out
• Switch power stations from coal to renewables (solar, wind), so less CO₂ is released
• Improve public transport so fewer petrol/diesel cars are used - Make sure each point is a mitigation, not adaptation
• Mitigation = reducing the cause (greenhouse gas emissions)
• Both points lower CO₂ released, so both are valid
Final answer
Mitigation means tackling the CAUSE (cutting greenhouse gas emissions) — keep it separate from adaptation, which deals with the effects.
IB-style question — carbon saved by switching to wind [1]
A coal power station releases 900 tonnes of CO₂ per day. Replacing it with a wind farm would cut emissions to 90 tonnes of CO₂ per day.
Calculate the percentage reduction in daily CO₂ emissions. [1]
How to answer it, step by step
- Write the formula, then put the numbers in
• % reduction = (fall in value ÷ original value) × 100
• fall = 900 − 90 = 810; so = (810 ÷ 900) × 100 - Work it out
• 810 ÷ 900 = 0.9
• 0.9 × 100 = 90%
Final answer
For a percentage reduction, divide the SIZE OF THE FALL by the ORIGINAL value, then ×100 — don't divide by the new value.