Constructing sea walls and raising structures in a coastal area against sea-level rise mainly exemplifies:

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1. **Adaptation** means actions that help people and places cope with the effects of climate change.
2. Building sea walls and raising buildings protects the coast from higher sea levels and floods.
3. **Mitigation** and **carbon sequestration** aim to reduce or store greenhouse gases, not protect places directly.
4. **Geoengineering** refers to large-scale deliberate changes to the climate, not local protective works.
5. Thus, these measures are clear examples of adaptation.

FINAL_ANSWER: d

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