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The C40 Cities Climate Leadership Group (C40) is a network of large and engaged cities from around the world committed to implementing meaningful and sustainable climate-related actions locally that will help address climate change globally.

Recognizing that cities consume over two-thirds of the world’s energy and account for more than 70% of global CO2 emissions, our organization’s global field staff works with city governments, supported by our technical experts across a range of program areas to reduce carbon emissions and increase energy efficiency in large cities across the world.

The current chair of the C40 is Rio de Janeiro Mayor Eduardo Paes, and 108th Mayor of New York City Michael R. Bloomberg is President of the Board. The Steering Committee includes: Berlin, Buenos Aires, Copenhagen, Hong Kong, Houston, Jakarta, Johannesburg, London, Los Angeles, Rio de Janeiro, Seoul and Tokyo.

Cities to Take Center Stage During Climate Week

Next week, environmental groups and business and government leaders from around the world will convene in New York City for Climate Week NYC, sponsored by C40 partners, the Climate Group and CDP. C40 cities represent more than 500 million people around the world, making us a significant voice demanding climate action of world’s leaders. Because of…

Expert Voices: Ritt Bjerregaard, former Lord Mayor of Copenhagen, on her role as a judge for the City Climate Leadership Awards

Once again I have had the honour to serve as a judge for the C40 & Siemens City Climate Leadership Awards, taking place during Climate Week NYC in September. Over the past few months, the other judges and I have read and evaluated no less than 31 shortlisted projects – chosen from 87 total entries –…

C40 Chair, Rio de Janeiro Mayor Eduardo Paes Featured in Cities Today

This month’s issue of Cities Today – a magazine for urban planners and other city experts – featured an interview with C40 Chair, Rio de Janeiro Mayor Eduardo Mayor Paes. In the interview, Mayor Paes talks about his goals as the new chair of C40 Cities, and shares the major sustainability efforts his city has…

Unleashing the power of data for Good

By James Hodson, Bloomberg R&D Humans solve problems by identifying the common patterns that can unlock similarities, explain differences, and relate diverse facts into a coherent whole. As the number of sources of information grows, systems become more complex, and social interactions take hold, decision making becomes hard; more an art than a science, prone…

12 Twitter Handles You Should Follow

Nearly 16,000 of you follow C40 Cities on Twitter – and we do our best to keep you up to date with everything important when it comes to cities and climate change. Each day, more and more voices join the conversation about cities and climate action happening in the Twitterverse, and we’re pleased that so many of…

Research Spotlight: C40 Cities Lead the Way in Measurement & Reporting – Infographic

In this next installment of the C40 Research Spotlight series, we present findings from this year’s CDP Cities reporting cycle. A record 61 C40 cities reported to CDP in 2014. The results show that C40 cities are leading the way in measuring and reporting emissions, risks, and taking mitigation and adaptation actions. Cities have been doing…

New Report Shows Cities Realize Economic Benefits of Taking Actions to Protect Against Climate Change Impacts

Today, C40, its partner CDP and AECOM released Protecting Our Capital, a new report that highlights the risks climate change poses to businesses in cities – and shows how city government climate adaptation actions are contributing to business resilience. Of the 207 cities surveyed in the report, 75 percent report that climate change impacts threaten the…

31 Finalist Projects Announced for 2014 City Climate Leadership Awards

Today, Siemens and the C40 Cities Climate Leadership Group (C40) announced the 31 projects representing 26 cities that have been selected as finalists for the 2014 City Climate Leadership Awards. Of these projects, which demonstrate leadership in taking climate action, winners in each of ten categories will be announced at the second annual Awards Ceremony…

In World Cup Spotlight, Rio Scores Goals on Urban Environment & Sustainability

With the World Cup now underway, all eyes are on the cities of Brazil playing host to the epic, international football competition. But there’s more to celebrate, according to C40 Chair, Rio de Janeiro Mayor Eduardo Paes. His city recently took the opportunity to mark World Environment Day, with trademark exuberance. Engaging citizens, businesses, NGOs…

Johannesburg the First C40 City to Issue Green City Bond

Johannesburg recently issued its first green city bond, making it the first C40 city to tap into this innovative financing mechanism. Green city bonds raise funds from fixed income investors to support city government projects that mitigate climate change. Executive Mayor of Johannesburg Mpho Parks Tau applauded the historic moment: “This clearly demonstrates investor confidence in the…

Shenzhen Joins C40 & Marks 2014 China National Low-Carbon Day

Earlier this week, Shenzhen joined C40 as our first mainland Chinese city with Megacity member status China. The move brings the total number of C40 member cities to 68. By joining C40, Shenzhen, home to 10.6 million people and the second largest port in China, will have the opportunity to share the challenges and successes it has faced in…

Research Spotlight: New Publications Highlight 10 Cities Delivering Best in Class Climate Action Reporting

In this next installment of the C40 Research Spotlight series, we hear from our very own Ava Zekri, Measurement & Reporting Manager, on exciting new reports that have been developed with some of our key research partners. – Seth Schultz, C40 Director of Research, Measurement & Planning What climate risks does the city of Melbourne…

Mayors Voices: ‘Taking Actions Today Can Ensure a More Sustainable Tomorrow’ says Los Angeles Mayor Eric Garcetti

I recently joined the Steering Committee of the C40 Cities Climate Leadership Group. I also recently celebrated the installation of what will be the largest single-rooftop solar power system in Los Angeles county at Forever21: a 5.1 megawatt system that when fully functionally this fall will displace 13 million pounds of carbon dioxide – the…

Mayors Voices: Boston Mayor Marty Walsh

Boston has been a leader in climate action for a long time. In 2007 Boston became the first U.S. city to adopt green building zoning requirements. That same year, the City of Boston adopted aggressive greenhouse gas reduction goals—25% by 2005 and 80% by 2050—and launched its triennial climate action planning process to address both…

Mayors Voices: Lord Mayor of Copenhagen Frank Jensen on Joining the C40 Steering Committee

I was very honoured when I learned that Copenhagen had been elected to represent the 19 Innovator cities in the C40 Steering Committee. C40 plays a great role in making the world’s cities more sustainable. The fact that we are now represented in the C40 Steering Committee is a big recognition of Copenhagen’s efforts to…