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. Cities are where the future happens first. The C40 Cities Climate Leadership Group connects more than 90 of the world’s greatest cities, representing over 650 million people and one quarter of the global economy. Created and led by cities, C40 is focused on tackling climate change and driving urban action that reduces greenhouse gas emissions and climate risks, while increasing the health, wellbeing and economic opportunities of urban citizens.
The C40 Cities Climate Leadership Group, now in its 11th year, connects more than 90 of the world’s greatest cities, representing 650+ million people and one quarter of the global economy. Created and led by cities, C40 is focused on tackling climate change and driving urban action that reduces greenhouse gas emissions and climate risks, while increasing the health, wellbeing and economic opportunities of urban citizens. The chair of C40 is Mayor of Paris Anne Hidalgo, and three-term Mayor of New York City Michael R. Bloomberg serves as President of the Board. C40’s work is made possible by our three strategic funders: Bloomberg Philanthropies, Children’s Investment Fund Foundation (CIFF), and Realdania.
C40 was founded on the idea that cities can achieve more by working together than acting alone. C40’s international staff supports mayors of the world’s megacities to deliver bold, ambitious and transformational action on climate change, through the exchange of ideas, programmes and policies; world class research; technical expertise; events that convene the world’s foremost climate experts and communications support to highlight the individual achievements and collective leadership of cities.
Working across multiple sectors and issues, C40 convenes networks that provide a range of services in support of cities’ climate change efforts. C40 has 17 networks organised under 6 initiative areas covering the mitigation, adaptation and sustainability topics of highest priority to C40 cities and with the potential for the greatest climate impact.
C40 networks help cities replicate, improve and accelerate climate action. These city-only working groups provide for honest knowledge exchange, enabling cities to tap into the global expertise of their peers as well as connect with technical partners. Through networks, cities find opportunities to undertake joint projects in areas of mutual interest and benefit. C40 networks also amplify individual city solutions by providing a global platform for showcasing city successes.
C40 Networks Lead to Results
One third of the actions member cities reported were directly influenced by collaboration between cities, 80% within C40. These actions are the result of our Networks' four-pronged approach, designed to:
Connect city officials with their peers around the world to help deliver solutions to climate challenges;
Inspire innovation by showcasing the ideas and solutions of leading global cities;
Advise city peers based on experience with similar projects and policies; and
Influence national and international policy agendas and driving the market by leveraging the collective voice of cities.
Below, we invite you to explore our networks, which are organized into Initiative areas.
Consolidated fact sheets about our networks are also available for download in English, Spanish, and Mandarin.