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.
The first edition of a new C40 event series, C40 Talks: How Mayors Are Getting the Job Done, took place at the New York Times Building conference center on Monday, September 18th, kicking off Climate Week NYC 2017. Learn more about this event.
C40's most recent report analyses the contribution C40 cities can make to delivering the Paris Agreement objective of limiting global temperature rise to 1.5 degrees, and what is required during the critical period from now to 2020.
Supporting early engagement between cities and the private sector to accelerate the deployment of climate solutions.
Leading cities around the world are searching for innovative solutions to the major sustainability challenges they face. C40, the Danish cleantech cluster CLEAN, and the International Cleantech Network have launched the CSP as a way to support early engagement between cities and the private sector to accelerate the deployment of climate solutions.
COP21 brought cities into the spotlight. C40 is proud to help shine that light a little brighter. Because cities and mayors are acting now, and we're right beside them as they become necessary leaders in this vital cause.
The first edition of a new C40 event series, C40 Talks: How Mayors Are Getting the Job Done, took place at the New York Times Building conference center on Monday, September 18th, kicking off Climate Week NYC 2017. Learn more about the event here.
What We're Working On
C40 launched a series of new partnerships and programmes at this year's summit, and our Mayors made new commitments to advance the pace of bold climate action.
The sixth biennial Mayors Summit, C40’s flagship event, ushered in the organization's most ambitious slate of announcements. From urban waterfront redevelopment to eliminating diesel vehicles, C40 Mayors helped advance a shared agenda through collaboration, knowledge sharing, and increased visibility of climate actions in cities.
Learn more about our latest programme, C40 Inclusive Cities, by watching the film above. This new programme will complement existing C40 efforts to help ensure climate action also creates greater social equity and sustainable cities for all.
From the Office of the Chair
New C40 Chair and Mayor of Paris Anne Hidalgo is C40's next global ambassador for cities. Follow along as we track Mayor Hidalgo and other Vice Chairs of C40 as they help shape the world, one changed city at a time.
Foreign Policy presented its annual “Green Diplomat of the Year” award to C40 for the organisation’s efforts to promote climate action around the world.
Foreign Policy gave C40 its top green diplomacy award, and Mayor Hidalgo accepted on behalf of the organization she now chairs, saying: “I am aware of the weight of responsibility this award carries, and I would like to share it with my fellow mayors from around the world.”
Mayor of Paris Anne Hidalgo formally took over as the new chair of C40 Cities during the 2016 Mayors Summit. She thanked Mayor of Rio de Janeiro Eduardo Paes for his exemplary leadership of the group and received a symbolic bonsai tree from Mayor Paes and C40 President of the Board, U.N. Secretary-General’s Special Envoy for Cities and Climate Change and 108th Mayor of New York City, Michael R. Bloomberg.