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Royal Park Shiodome Tower, part of Tokyo's Green Building Program. (Not Quite a Photographr / Flickr)
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Global Leadership on Climate Change

Tokyo

Japan

An environmental performance rating program for new buildings will green the Tokyo real estate market. Read the case study

Bogotá’s CicloRuta is one of the most extensive bicycle path networks in the world. (Pattoncito / Flickr)
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Global Leadership on Climate Change

Bogotá

Colombia

Bogota’s CicloRuta is one of the most comprehensive bicycle path networks in the world. Read more about CicloRuta

Eco-building cuts CO2 87%, electricity 82%, gas 87% and water 72%.
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Global Leadership on Climate Change

Melbourne

Australia

Melbourne Council House 2 is an inspirational building that has reduced CO2 emissions, electricity, gas and water consumption.

Seoul car-free days have reduced CO2 emissions by 10% annually. (iStockphoto)
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Global Leadership on Climate Change

Seoul

Republic of Korea

Car-free days have reduced C02 emissions by 10% annually & improved the health of the city’s residents. See the case study

The City of Berlin in partnership with Berlin Energy Agency (BEA) has done pioneer work to develop and apply an excellent model to improve energy efficiency in buildings.
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Global Leadership on Climate Change

Berlin

Germany

Germany’s largest city has created an innovative energy efficiency program that slashes emissions. Read the case study

Solar PV systems at Queens Botanical Garden improves energy efficiency and reduces greenhouse gas emissions. (Joe Shlabotnik / Flickr)
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Global Leadership on Climate Change

New York

United States

New York City government is leading by example to reduce municipal greenhouse gas emissions 30% by 2017.Read the case study

IMAGE CREDIT: Not Quite a Photographr / Flickr

IMAGE CREDIT: Pattoncito / Flickr

IMAGE CREDIT: C40 Cities

IMAGE CREDIT: Joe Shlabotnik / Flickr

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. Through a partnership with the Clinton Climate Initiative, 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 their current initiatives.

A welcome message from C40 Chair, New York City Mayor Michael R. Bloomberg.

Cities are the way forwardThe work that the C40 Cities has already accomplished has been critical for reducing carbon emissions worldwide, but there is far more to be done, as Mayor Bloomberg explains.

“While international negotiations continue to make incremental progress, C40 Cities are forging ahead. Collectively they have taken more than 4,700 actions to tackle climate change, and the will to do more is stronger than ever. As innovators and practitioners, our cities are at the forefront of this issue – arguably the greatest challenge of our time.                                                                                                                          —Mayor Michael R. Bloomberg

Meet the C40 Cities taking action.

Our research shows more than proof of action — it is also an expression of C40’s opportunity to make an even greater impact on climate change going forward.

Acting both locally and collaboratively, cities are making a meaningful global impact by implementing sustainability practices.

Acting both locally and collaboratively, cities are making a meaningful global impact by implementing sustainability practices.

Explore our latest research further to learn more about our work.

Contact C40

Have a question or need more information from C40? Contact us.