C40, together with research partner CDP, offers one of the most comprehensive sets of city climate change data on the planet. The 2013 open dataset provides an exhaustive catalogue of how 110 cities around the world are dealing with climate change, including 80% of the C40 membership. Check out the new In-Focus city reports and follow our Research Spotlightblog series for news and discussion about C40's dynamic Research programme.
February 4-6, 2014, Johannesburg hosted the fifth biennial C40 Mayors Summit, convening mayors to advance "toward resilient and livable Megacities-demonstrating action, impact, and opportunity."Watch videos from the Summit.
Germany’s largest city has created an innovative energy efficiency program that slashes emissions.Read the case study.
The C40 Cities Climate Leadership Group (C40) is a network of the world’s megacities committed to addressing climate change.
Acting both locally and collaboratively, C40 Cities are having a meaningful global impact in reducing both greenhouse gas emissions and climate risks. C40 brings together a unique set of assets and creates a shared sense of purpose. C40 offers cities an effective forum where they can collaborate, share knowledge and drive meaningful, measurable and sustainable action on climate change.
"We are on the eve of a decisive moment in the fight against climate change. The United Nations debates the adoption of new Sustainable Development Goals and negotiates an agreement to replace the Kyoto Protocol. We mayors have a prominent role to play in this process. We are engaging in city diplomacy by delivering concrete results and building leadership. We have sent a letter to the UN to acknowledge that urban issues should be a priority."