Climate change impacts and governance
Interpret future-climate projections, trace environmental and social impacts, and evaluate global governance, mitigation and adaptation.
Exam scope and assessment notes
Cambridge International AS & A Level Geography 9696, 2027–2029 syllabus, Topic 11. Across every topic, practise reading both quantitative and qualitative geographical resources, describing patterns before explaining them, evaluating evidence and producing a structured, supported conclusion. These original explanations and self-checks are independent study support, not Cambridge questions, official marks or grades. Centre-selected named examples and detailed case studies still need course-specific evidence packs. Full timed mock papers, official marking or grade prediction, and human subject-teacher review are not provided. Fieldwork is not assessed in this syllabus, but this site does not collect or supervise primary data.
Before you begin
- Cambridge recommends prior Geography at approximately Cambridge IGCSE or Cambridge O Level. Read the source and its scale before explaining patterns; support evaluation with relevant evidence.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What is a positive climate feedback?
What you will learn
- Compare five projection categories and explain net zero
- Connect climate feedbacks and tipping points to cold, marine and atmospheric environments
- Assess socio-economic impacts and patterns of vulnerability
- Evaluate governance, mitigation and adaptation with justice and implementation constraints
Projection categories describe conditional futures
The syllabus uses very high, high, intermediate, low and very low projected-change categories. Compare the assumed greenhouse-gas pathway, warming by 2100, peak and net-zero timing where given, and resulting changes in sea level, precipitation and extreme events. These are conditional projections, not a date-specific forecast for one locality.
Net zero means balancing remaining greenhouse-gas emissions with removals; it does not mean that all emissions stop or that warming immediately reverses. Greenhouse-gas longevity means climate changes can continue beyond 2100 even under lower pathways.
Feedbacks link environmental systems and people
Positive feedback amplifies an initial change; negative feedback reduces it. Ice and snow loss can lower albedo and increase absorption, while permafrost thaw may release greenhouse gases. A tipping point is a threshold after which a system may change rapidly or become difficult to reverse; its exact location and timing remain uncertain.
Sea-level rise, marine temperatures and circulation, cold-region snow, ice and permafrost can interact. Socio-economic impacts include risks to habitation, food production and property. Vulnerability reflects location, history, politics, income, dependence on sensitive ecosystems and access to resources; low-income households, small food producers, small-island communities and Indigenous groups may face particular constraints, but outcomes vary within groups.
Governance combines mitigation and adaptation
The IPCC assesses evidence; the UNFCCC and COP process support negotiation. The Paris Agreement is a global framework, while national policies determine implementation. Mitigation reduces emissions or increases storage through energy change, efficiency, carbon accounting, nature-based solutions or carbon capture; solar-radiation management has distinct risks and governance questions.
Adaptation includes protection, accommodation and retreat. Strategy choices depend on finance, technology, institutions, time, geography and justice. Compare who contributed to emissions, who faces impacts, who pays and who decides. A named pair of contrasting country strategies must be selected for the learner's course.
Sources for this lesson
Pause and explain
Why can a small-island community be highly vulnerable even when its emissions are low?
Worked example
Two hypothetical pathways produce 1.8°C and 3.6°C warming above a stated baseline by 2100. Give two likely differences in projected global conditions and one reason impacts will not be uniform.
Show the worked solution
- The higher-warming pathway is associated with greater sea-level rise and larger shifts in precipitation or extreme-event risk, though exact outcomes vary by region.
- Changes to cold, marine and atmospheric environments may interact through feedbacks.
- Exposure, vulnerability, adaptation capacity and reliance on sensitive ecosystems vary among places and groups.
Answer The higher pathway implies larger global changes, but local impacts depend on environmental setting, exposure and capacity to adapt. Scenario values are conditional on their assumptions.
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 low-emissions projection still shows sea-level rise late in the century. Explain why this is possible and identify one uncertainty in a local impact estimate.
Give me a hint
Consider the lifetime of greenhouse gases and the difference between global projections and local exposure.
Compare my reasoning
- Past and current emissions keep influencing the energy balance because some greenhouse gases remain in the atmosphere for a long time.
- Sea levels and ocean systems also respond over time, so changes can continue even if future emissions fall.
- Local impacts depend on coast shape, land movement, storms, settlement and adaptation.
Long-lived gases and slow system responses mean change can continue. A local estimate also needs coastal, storm and exposure evidence.
Look for these in your work
- Time lag explained
- Local/global scales distinguished
- One uncertainty identified
Explain how loss of reflective sea ice can strengthen warming, then state why this does not give a precise tipping-point date.
Give me a hint
Trace the albedo feedback and distinguish a mechanism from its future timing.
Compare my reasoning
- Less ice exposes darker water or land, which absorbs a larger share of incoming energy.
- Additional warming can contribute to further ice loss, creating a positive feedback.
- Feedback strength varies with interacting processes and evidence; a mechanism does not specify a threshold date.
Ice loss can amplify warming through lower albedo, but observations and models do not establish one exact date for a tipping point.
Look for these in your work
- Causal sequence complete
- Positive feedback classified
- Timing uncertainty retained
Compare an emissions-reduction plan with a coastal retreat plan for a low-lying community. Evaluate both through effectiveness and climate justice.
Give me a hint
Separate mitigation from adaptation and examine authority, cost, timescale and distribution.
Compare my reasoning
- Emissions reduction is mitigation and addresses a wider cause, but its global benefit may not prevent near-term local flooding.
- Retreat is adaptation that can reduce exposure, but relocation may disrupt livelihoods, culture and rights and needs consent and support.
- Compare responsibility, funding, participation, residual risk and who gains or loses.
Both may be justified at different scales, but a fair decision needs local participation and resources and should distinguish global emissions benefits from local risk reduction.
Look for these in your work
- Strategies classified
- Scale and timescale addressed
- Justice and distribution included
Common mistakes
- Treating a projection category as a precise local forecast
- Confusing net zero with zero gross emissions
- Calling every feedback positive
- Assuming a tipping point's timing is known exactly
- Judging a climate agreement by its target without examining implementation or justice
What can you explain now?
Does net zero require balancing residual emissions with removals, or eliminating every emission?
Compare with the explanation
Balancing residual emissions with removals
Net zero is a balance; it does not mean that all gross emissions immediately cease.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Use one feedback, one vulnerability factor and one governance strategy to explain why climate responses differ between places.
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.