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Climate adaptation reduces harm from climate impacts communities are experiencing or expect; climate mitigation reduces greenhouse-gas emissions or increases the amount removed from the atmosphere. Communities need both: adaptation addresses local risks, while mitigation limits the additional warming that intensifies those risks. The right actions and timing depend on local hazards, vulnerability, resources and priorities—not a universal formula.
What is the difference between adaptation and mitigation?
The IPCC defines adaptation in human systems as “the process of adjustment to actual or expected climate and its effects, in order to moderate harm or exploit beneficial opportunities.” Mitigation is human intervention to reduce greenhouse-gas emissions or enhance greenhouse-gas sinks. In practical terms, adaptation responds to climate effects; mitigation acts on the drivers of climate change.
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That difference shapes what each can accomplish. A flood warning system can help people respond to a specific local hazard. Cutting emissions helps limit future warming broadly, rather than protecting one place from one impact on its own. Neither function replaces the other.
What might a community need?
There is no single adaptation package suitable for every community. The UNFCCC gives examples including flood defences, cyclone early-warning systems, drought-resistant crops, and changes to communications, business operations or government policies. Which measures make sense depends on the hazards and circumstances in a particular place.
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Adaptation can also involve decisions beyond physical infrastructure. The IPCC describes local actions such as updating building codes and land-use plans, improving soil management and water-use efficiency, supporting migrants, and reducing poverty. These measures can affect different people in different ways, so planning needs to consider who is exposed, who has fewer resources to respond, and how benefits and burdens are distributed.
Mitigation likewise reaches beyond individual consumer choices. The IPCC identifies emissions reductions in energy production and use and in land use, alongside measures to enhance carbon sinks. Local and regional planning can connect lower-emissions energy and transport decisions with adaptation priorities.
How should communities decide what to do?
Start with local risk, not a preselected list of projects. A useful decision process brings together information about hazards, exposure and vulnerability with community knowledge and priorities. It then compares possible actions by how well they reduce risk or emissions, whether they are feasible with available resources, who benefits or bears costs, and what trade-offs they create.
- Define the goals: Make clear whether the priority is, for example, health, water or food security, employment, poverty eradication or ecosystem services.
- Consider equity and justice: Identify groups who may face greater risks or have fewer resources, and assess how the proposed action affects them.
- Build a portfolio: Adaptation often requires actions across sectors, places, actors and time horizons rather than reliance on one intervention.
- Check for trade-offs: A measure can reduce one risk while creating burdens elsewhere. Compare effectiveness and feasibility alongside distributional effects.
- Monitor and revise: Track whether actions are working and adjust as risks, evidence and feasible options change.
The IPCC characterizes sound adaptation options as effective, feasible and consistent with justice principles. Even well-chosen measures can leave residual risk, so planning should not imply that all harm can be eliminated.
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When should adaptation and mitigation happen?
Communities do not need to finish adaptation before beginning mitigation, or the reverse. The IPCC says implementing both together can improve effectiveness by capturing synergies and reducing trade-offs, particularly when climate action is integrated with sustainable development.
Adaptation planning is iterative: build awareness, assess risks and options, plan, implement, monitor and evaluate, then adjust. Meanwhile, emissions reductions address the longer-term driver of worsening climate risks. A community can act on urgent local threats while supporting measures that limit additional warming.
Delay can make adaptation harder. The UNFCCC notes that faster climate change and longer delays in adaptation make responses more difficult and expensive. The IPCC also reports that the effectiveness of many adaptation options declines as warming increases. Adaptation is essential, but it is not sufficient without ambitious emissions reductions.
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The evidence does not establish a generally correct percentage of community resources to allocate to adaptation versus mitigation, nor one sequence that fits every place. A community facing an immediate, severe hazard may need urgent risk-reduction measures, while still considering emissions cuts with long-term benefits. Setting priorities requires local evidence about hazards, vulnerability, budgets and the time horizon of decisions.
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