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.

Explore an interactive list of the C40 Cities and our Networks and Research connecting them.

C40 Chair & China's Premier Hold Landmark Meeting 

C40 Chair, Rio de Janeiro Mayor Eduardo Paes and China's Premier Li Keqiang just held a landmark meeting on topics including the advancement of climate action in Chinese cities. In November 2014, President Xi signaled China’s commitment to finding solutions to climate change when he announced the nation’s targets to peak CO2 emissions around 2030 or earlier and to increase to 20 percent the share of its energy from non-fossil fuel sources by 2030 – a goal that cities can help to reach.

To reflect China’s size and leadership in the global population, economy and ambition to de-couple economic growth from greenhouse gas emissions, Mayor Paes’ discussed with the Prime Minister how C40 could expand Chinese city membership and to establish a regional office in Beijing.

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10 Years of Results

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C40 is a data-driven organization – our mayors know firsthand that if you can’t measure it, you can’t manage it, and we adhere to that philosophy. The graphic above showcases indicative metrics for C40.

2015 marks the 10-year anniversary of the C40 Cities Climate Leadership Group. To celebrate these 10 Years of Results, we will be sharing our favorite lists of 10 results throughout the year, highlighting the many accomplishments of C40 and its member cities:

Join us as we build on the successes of the past 10 years to forge a brighter future, and stay up to date on the #RoadToParis by following us on Twitter, liking us on Facebook, and connecting with us on LinkedIn