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In 2020, C40 Cities Climate Leadership Group (C40) and the Mayors Migration Council (MMC) worked together to better understand and draw attention to the intersection of climate change and migration in cities, elevating how city leadership is responding to these forces to work towards climate resilience, inclusion and equity. Through this effort, and in consultation with cities and experts from around the globe, the partnership established a body of knowledge on:

• How climate change and migration – and the multifaceted ways in which they influence each other – are affecting cities;

• The role of mayors as leaders in addressing the pressing challenges and opportunities presented by climate and migration, intentionally and holistically; and 

• What cities need from national and multilateral actors to do this work more effectively.

Informed by a consultancy effort led by HR&A Partners, C40-led desk research and interviews with city officials and experts, this paper is the culmination of the partnership’s work over the course of 2020 and into 2021. It seeks to provide cities and climate change and migration practitioners with a clearer understanding of how these complex dynamics play out in cities; to elevate best practices from around the globe; and to be a resource for advocacy efforts to influence decision-making and leverage national and international bodies to provide the financial, policy, data and capacity-building support necessary for cities to continue leading the way.