Climate change—mitigation and adaptation

· Guiding question: How can human societies address the causes and consequences of climate change?
· Mitigation = actions that reduce climate change causes by lowering GHG emissions, slowing global warming, or increasing carbon sinks.
· Adaptation = actions that reduce harm from climate change impacts or make use of possible benefits.
· Top exam distinction: mitigation tackles the cause; adaptation tackles the consequences.

Global action and international cooperation

· Global action is essential because catastrophic climate change cannot be avoided by action from only some states.
· State sovereignty can slow action because each country controls its own policies, energy choices and economic priorities.
· International cooperation occurs through negotiations, protocols, conventions and treaties.
· Key examples: UNFCCC, Kyoto Protocol, Paris Agreement, COP summits.
· Sanctions or trade tools, such as cross-border carbon taxes, may be used to discourage high-carbon production.
· Exam angle: discuss equity, responsibility, capacity to act and climate justice, not just technology.

Decarbonization and carbon neutrality

· Decarbonization = reducing or ending use of energy sources that produce CO₂ emissions.
· It involves replacing fossil fuels with renewable energy sources such as solar, wind, hydroelectric, geothermal and sustainable bioenergy.
· Carbon neutrality = achieving net zero carbon emissions, usually by balancing remaining emissions with carbon removal or offsets.
· Countries set different net zero target dates, reflecting differences in development, wealth, energy dependence and political priorities.
· Exam angle: evaluate whether targets are credible, legally binding, funded, and supported by measurable policy mechanisms.

Mitigation strategies: three categories

· 1. Reduce the process of global warming: examples include household energy-saving changes, cool roofs, reduced air conditioning demand, and large-scale geoengineering proposals.
· 2. Reduce production of GHGs: examples include energy efficiency, renewable energy, public transport, electric vehicles, low-meat diets, sustainable agriculture, carbon taxes and emissions standards.
· 3. Remove CO₂ from the atmosphere: examples include afforestation, rewilding, protection of carbon sinks, soil carbon storage, carbon capture and storage (CCS) and direct air capture.
· Strong answers compare strategies using effectiveness, cost, scale, time lag, equity, political acceptability and possible unintended consequences.
· Avoid vague answers such as “plant trees” without explaining carbon sequestration, land-use trade-offs and long-term storage.

This graph illustrates why early and steep emissions reductions are central to mitigation. It helps students connect emissions pathways with climate targets and delayed-action risks. Source

Carbon sinks, sequestration and carbon capture

· Carbon sink = a system that has net uptake of carbon, such as growing forests, wetlands, soils or oceans.
· Carbon sequestration = capture and storage of atmospheric CO₂ in biomass, soils, sediments or geological stores.
· Afforestation = planting forest where there was not previously forest; reforestation = restoring forest where it existed before.
· Rewilding can increase biomass, restore ecosystem resilience and enhance carbon storage, but may conflict with food production or land rights.
· CCS captures CO₂ from industrial processes or power stations and stores it underground; direct air capture removes CO₂ directly from air.
· Limitations: high cost, energy demand, storage uncertainty, possible greenwashing, and slower impact than immediate emissions cuts.

Adaptation strategies: structural and non-structural

· Adaptation strategies aim to reduce adverse effects of climate change and maximize any positive consequences.
· Structural adaptation = physical or engineered changes; examples include flood defences, sea walls, desalination plants, movable infrastructure, storm drains and climate-resilient buildings.
· Non-structural adaptation = policy, behaviour, planning or management changes; examples include land zoning, building codes, drought-resistant crops, altered planting dates, vaccination programmes and early-warning systems.
· Structural measures are often visible and protective, but may be expensive, create false security or transfer risk elsewhere.
· Non-structural measures may be cheaper and flexible, but require education, governance, compliance and long-term planning.
· Exam angle: adaptation is necessary because some climate change impacts are already unavoidable due to time lags in the climate system.

Adaptation plans and resilience planning

· Individuals and societies develop adaptation at different scales: individual, community, city, national, regional and global.
· National Adaptation Programmes of Action (NAPAs) help developing countries identify urgent local priorities for addressing climate impacts.
· Resilience and adaptation plans aim to protect health, water supply, food systems, infrastructure, coasts and vulnerable communities.
· Good adaptation planning should include risk assessment, vulnerability mapping, stakeholder participation, finance, monitoring and review.
· Strong exam answers link adaptation to resilience: the capacity of a system to resist, recover from or adapt to disturbance.

This map shows the global distribution of carbon pricing tools. It supports discussion of how economic measures can encourage emissions reductions, while also raising questions about fairness and implementation. Source

Perspectives, stakeholders and climate action

· Stakeholders can change public perspectives through evidence, campaigning, media, education, social pressure and policy.
· Examples of stakeholders: charismatic individuals, local community groups, NGOs, media, schools, businesses and governments.
· Views on urgency vary because of age, wealth, location, risk exposure, employment, culture, and whether an economy benefits from fossil fuels.
· Tragedy of the commons applies because the atmosphere is shared: one nation can benefit from emissions while climate costs are distributed globally.
· Climate solutions also show the reverse problem: one country may pay for carbon removal, but benefits are shared by all.
· High-scoring answers consider conflict, cooperation, equity, and who pays versus who benefits.

Exam command term prompts

· Explain: “Explain why mitigation requires international cooperation.” → refer to global atmosphere, state sovereignty, treaties, and shared responsibility.
· Compare: “Compare mitigation and adaptation.” → mitigation reduces causes; adaptation reduces impacts; both are needed.
· Evaluate: “Evaluate geoengineering as a climate strategy.” → include benefits, risks, uncertainty, governance and why it does not replace emissions cuts.
· Discuss: “Discuss carbon taxes.” → include incentives, polluter pays principle, economic burden, public acceptability and equity.
· Apply: Use a named society to show how one technology, policy or adaptation plan addresses a specific climate risk.

Common mistakes to avoid

· Do not confuse ozone depletion with global warming.
· Do not describe adaptation as preventing climate change; it reduces damage from impacts.
· Do not write only individual actions; include government, industry, international and community-scale responses.
· Do not say carbon neutral means zero emissions; it usually means net zero after removals or offsets.
· Do not evaluate strategies using only cost; include equity, effectiveness, feasibility, time scale and unintended consequences.