Environmental factors have long had an impact on global migration flows, as people have historically left places with harsh or deteriorating conditions. However, the scale of such flows, both internal and cross-border, is expected to rise as a result of accelerated climate change, with unprecedented impacts on lives and livelihoods. Such migration can have positive and negative effects on both the local coping capacity and the environment in areas from which these migrants originate, as well as in their temporary or permanent destinations. The impacts of these changes and the associated mobility dynamics vary from one region to another. IOM capacity building activities aim to: (1) build the capacity of policymakers and practitioners in order to factor migration into environmental and development policies, as well as climate change adaptation strategies, and to take environmental change into account in comprehensive migration management policies at the national level; (2) facilitate policy exchange in migration, environment and climate change among policymakers and practitioners. These capacity building activities are in line with Paragraph 14(f) of the Cancun Adaptation Framework, which first brought the notion of human mobility to international climate negotiations, the Paris Agreement and COP21 Decision, and the Marrakesh Accords on Capacity Building in developing countries (Decision 2/CP.7). The IOM capacity building activities contribute to the formulation of policies on human mobility in the context of environment and climate change. To support these activities, IOM has developed a comprehensive interactive training tool - Migration, Environment and Climate Change: Training Manual (Facilitator’s Guide). Between 2020-2021, IOM programming on climate change and risk reduction trained over 85,000 community members, 7,000 government officials and 3,000 civil society representatives.