Evaluate climate impacts, mitigation and adaptation
Compare mitigation and adaptation strategies and evaluate impacts through exposure, sensitivity and capacity in a named place.
Section 8.2 · The impacts of climate change
Exam scope and assessment notes
Original StudyForA teaching and practice, not Cambridge-authored questions, mark schemes or official grades. Cambridge expects candidates to study all eight topics, carry out investigative work and learn teacher-selected case studies. This course does not replace a centre's named case-study examples, current local environmental data, supervised fieldwork or the candidate's own investigation. Practice datasets are illustrative, not observations from a real place. No official assessment or certification is provided. The examples and practice datasets in these lessons are fictional and formative; learners must add their centre's verified case studies and current local evidence.
Before you begin
- Cambridge recommends prior environmental/science study equivalent to IGCSE or O Level. This is an AS-only qualification; use the exam-year syllabus and confirm centre entry details.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What makes environmental evidence useful?
What you will learn
- Explain impacts across people and ecosystems
- Distinguish mitigation from adaptation
- Evaluate actions using vulnerability, effectiveness, equity, scale and time
Risk depends on vulnerability
Impacts vary with exposure, sensitivity and adaptive capacity. Two communities facing similar hazards may experience different consequences because of infrastructure, health, income, location and preparedness.
A national average can hide differences between communities and groups. Use place-specific and disaggregated evidence when assessing impacts.
Impacts vary between environments and people
The syllabus impacts include changes in temperature and precipitation, sea level, ocean and wind circulation, sea ice, ice sheets, glaciers and permafrost, and species distribution and biodiversity. Human impacts include extreme-weather flooding, land loss, drought and wildfire, property damage, deaths, forced migration, crop-yield changes and pest outbreaks, with consequences for food, energy and water security.
Mitigation reduces greenhouse-gas emissions or increases removals; adaptation reduces vulnerability to current or expected impacts. Compare lower-carbon fuels, alternative energy, transport policy, carbon capture and storage, reduced deforestation, reforestation, efficient buildings, lifestyle changes, adaptation and international agreements. The syllabus also includes solar-radiation-management geo-engineering such as albedo enhancement, space reflectors and stratospheric aerosols.
Sources for this lesson
Pause and explain
What distinguishes mitigation from adaptation?
Worked example
A coastal region faces greater flood risk. Compare one mitigation and one adaptation action.
Show the worked solution
- Choose an action that reduces emissions.
- Choose one that reduces exposure or vulnerability.
- Compare scale and identify local evidence.
Answer Replacing high-emission electricity with lower-emission supply is mitigation. Restoring coastal wetlands or improving warning and evacuation systems is adaptation. Evaluate local emissions, flood exposure, ecosystems, settlement patterns and who can access protection; the actions address different parts of risk.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
A city builds flood barriers and replaces coal electricity. Classify each and state one limitation.
Give me a hint
Classify by mechanism, not project label.
Compare my reasoning
- Identify the relevant data, place or process in the prompt.
- Apply explain impacts across people and ecosystems to the stated context.
- Explain the inference and one limitation or trade-off.
Flood barriers are adaptation because they reduce exposure, though they may shift erosion or create false security. Replacing coal electricity is mitigation because it can reduce emissions, though full benefit depends on the replacement supply and implementation.
Look for these in your work
- Explain impacts across people and ecosystems
- Uses relevant evidence and explains the environmental mechanism
- Distinguishes observation, inference and limitation
Two districts face the same projected heat increase, but one has less tree cover and fewer cooling centres. Explain why vulnerability differs.
Give me a hint
Risk depends on exposure, sensitivity and adaptive capacity.
Compare my reasoning
- Identify the relevant data, place or process in the prompt.
- Apply distinguish mitigation from adaptation to the stated context.
- Explain the inference and one limitation or trade-off.
Less shade can intensify local heat and fewer services reduce adaptive capacity. Compare age, housing, health, shade, cooling access and income by neighbourhood; a citywide average may hide the difference.
Look for these in your work
- Distinguish mitigation from adaptation
- Uses relevant evidence and explains the environmental mechanism
- Distinguishes observation, inference and limitation
A country evaluates a climate adaptation plan. What evidence would show effectiveness and equity?
Give me a hint
Measure outcomes and disaggregate who benefits.
Compare my reasoning
- Identify the relevant data, place or process in the prompt.
- Apply evaluate actions using vulnerability, effectiveness, equity, scale and time to the stated context.
- Explain the inference and one limitation or trade-off.
Compare hazard impacts before and after using suitable indicators, check costs and maintenance, and disaggregate outcomes by place and affected group. Include unintended effects and remaining risk; implementation alone does not prove effectiveness.
Look for these in your work
- Evaluate actions using vulnerability, effectiveness, equity, scale and time
- Uses relevant evidence and explains the environmental mechanism
- Distinguishes observation, inference and limitation
Common mistakes
- Treating mitigation and adaptation as interchangeable
- Ignoring unequal vulnerability and capacity
- Assuming one action is effective in every location
What can you explain now?
What distinguishes mitigation from adaptation?
Compare with the explanation
Mitigation addresses emissions or removals; adaptation reduces vulnerability to impacts
A plan may include both, but identify the mechanism of each action.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Why should a climate-management answer distinguish the mechanism of each action?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.