C40 Cities

C40 connects 96 of the world’s leading cities taking climate action to build


C40 is a network of the world’s megacities committed to addressing climate change. C40 supports cities to collaborate effectively, share knowledge and drive meaningful, measurable and sustainable action on climate change.

Around the world, C40 Cities connects 94 of the world’s greatest cities to take bold climate action, leading the way towards a healthier and more sustainable future. Representing 700+ million citizens and one quarter of the global economy, mayors of the C40 cities are committed to delivering on the most ambitious goals of the Paris Agreement at the local level, as well as to cleaning the air we breathe.

As a complement to our networks, C40 also provides additional services to member cities organized across a series of Programme areas.

In addition to formal peer-to-peer networks, C40 also offers member cities additional services through its Programme model. Programmes are designed to supplement and deepen the effectiveness of C40 networks, ensuring that city officials working together are able to draw upon a holistic range of support services to address the key barriers to city climate action.

Programmes evolve to meet city needs and range from localized direct support, to improved access to data, to broad-based partnered efforts around finance, city diplomacy, and inclusive climate action.


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Location New York, United States of America
Africa, Antarctica Region, Antigua and Barbuda, Argentina, Asia, Australia and New Zealand, Bahamas, Barbados, Belize, Bolivia, Brazil, Chile, Colombia, Costa Rica, Cuba, Dominica, Dominican Republic, Ecuador, El Salvador, Europe, Fiji, Grenada, Guatemala, Guyana, Haiti, Honduras, Jamaica, Kiribati, Mexico, Micronesia (Federated States of), Nauru, Nicaragua, Northern America, Palau, Panama, Papua New Guinea, Paraguay, Peru, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Samoa, Solomon Islands, Suriname, Tonga, Trinidad and Tobago, Tuvalu, Uruguay, Vanuatu, Venezuela
Environmental services, Clean technology, Clean technology and energy, Connectivity, EdTech, Green transportation and electric motors, HealthTech, Hydropower, Personal transport, Public transport, Renewable energy, Smart city solutions, Solar power, Transport and logistics, Waste management and recycling, Water, sanitation and hygiene, Wind power