Mainstreaming Climate Change Adaptation into Development and Planning. Mainstreaming climate change adaptation is the iterative process of integrating considerations of climate change adaptation into policy-making, budgeting, implementation and monitoring processes at national, sector and subnational levels. It is a multi-year, multi-stakeholder effort grounded in the contribution of climate change adaptation to human well-being, pro-poor economic growth, and achievement of the SDGs. It entails working with a range of government and non-governmental actors, and other actors in the development field.