This Toolkit has been developed by IOM in collaboration with UNEP and UNDP with the support of the European Union under the Mainstreaming Migration into International Cooperation and Development (MMICD) project. In the Toolkit, we explore how migration relates to the following sub-sectors: (i) the green economy and clean energy, (ii) climate change adaptation and resilience, (iii) disaster risk management, (iv) protection and sustainable management of natural resources for ecosystem services. It provides practical information and tools to help development practitioners integrate migration into environment and climate change interventions.