Climate Adaptation in East Africa: What the Evidence Says About What Works

East Africa is among the regions most exposed to accelerating climate risk. Erratic rainfall patterns, prolonged droughts, and increased frequency of extreme weather events are already reshaping livelihoods, food systems, and community stability across the region. The question for development actors is not whether to invest in climate adaptation — it is what kinds of investment actually work at the community level, and under what conditions.

This policy brief synthesises evidence from eighteen community-level climate adaptation programmes implemented across Kenya, Uganda, and Tanzania between 2018 and 2025. It identifies six evidence-based recommendations for policy and programme designers working in the region.

Key findings

1. Nature-based solutions outperform technology-led approaches in smallholder contexts. Across the programmes reviewed, farmer-managed natural regeneration (FMNR), agroforestry, and soil-water conservation practices delivered more durable adaptation outcomes than technology-intensive approaches, primarily because they draw on existing knowledge systems and do not depend on maintenance supply chains that rarely survive programme closure.

2. Women's participation in adaptation planning correlates strongly with household-level outcomes. Programmes with meaningful female participation in community adaptation committees (above 40%) showed significantly stronger household food security and income diversification outcomes than those without, consistent with broader evidence on women's role in household risk management.

3. Linking early warning systems to local decision-making dramatically increases their value. Early warning data — whether from national meteorological services or community-based weather stations — only translates into adaptation behaviour when communities understand the information, trust its source, and have a clear protocol for acting on it. Information provision without decision-support yields minimal behaviour change.

4. Multi-year funding cycles are not optional. Climate adaptation at the community level requires three to five years of sustained engagement before changes in practice become self-sustaining. Programmes funded on twelve or eighteen month cycles consistently fail to reach this threshold, regardless of their technical quality.

Recommendations

1. Fund adaptation programmes on minimum three-year cycles with explicit sustainability planning from year one.
2. Prioritise nature-based solutions that build on existing knowledge and do not require external maintenance infrastructure.
3. Require meaningful women's participation in adaptation governance as a programme condition, not an aspiration.
4. Invest in connecting early warning systems to community-level decision-making protocols, not just information dissemination.
5. Build cross-sector linkages between climate adaptation, nutrition, and water programming — the evidence consistently shows compound benefits when these are integrated.
6. Commission longitudinal tracking of adaptation outcomes at five and ten years post-programme — the evidence base for long-term community-level adaptation is currently too thin to guide effective policy.