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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 New York City Mayor Michael R. Bloomberg and the Steering Committee includes: Berlin, Hong Kong, Jakarta, Johannesburg, Los Angeles, London, New York City, Sao Paulo, Seoul and Tokyo.

Basel to Host the Global Infrastructure Basel Summit and C40 Finance Network Meeting

Basel to host the Global Infrastructure Basel Summit and C40 Finance Network meeting APRIL 17, 2014 Email Twitter Facebook A guest post by Basel Mayor Guy Morin The City of Basel is looking forward to hosting the annual Global Infrastructure Basel Summit on 21-22 May 2014, and, as co-chair of the C40 Sustainable Infrastructure Finance Network, a dedicated…

Houston Drives EV Green Changes with Perseverance and Partnerships

This post is authored by Margo Evans, Marketing Director, Smith & Associates and Founding Member of Smith Sustainability Group, Lisa Lin, Sustainability Manager, City of Houston, and Jedediah Greenfield, Public Information Officer, City of Houston. Sustainability is a critical element of the City of Houston’s planning. Over the next 15 years, this fourth-largest city in…

Mayor Paes: IPCC Report Highlights Need for ‘City Diplomacy’ to Spur Climate Action

Editor’s note: Rio Mayor Eduardo Paes is the current C40 Chair. C40 welcomes further definitive evidence from the Inter-governmental Panel on Climate Change (IPCC) of the impact that humanity is having on climate change, and the potential consequences to our way of life. The latest IPCC report, Climate Change 2014: Impacts, Adaptation, and Vulnerability, showed that many…

Expert Voices: Arnoud Molenaar, Manager, Rotterdam Climate Proof, City of Rotterdam

In the last few months, Rotterdam has met a series of milestones to make the city more climate resilient. Most recently, the city, together with all partner cities in the C40 Connecting Delta City (CDC) Network, is proud to have published the third volume of the C40 Connecting Delta Cities (CDC) book, ‘Resilient Cities and…

Expert Voices: Christiana Figueres, Executive Secretary of the UNFCCC

How megacities are becoming central players in the fight against climate change In November 2012, superstorm Sandy slammed into the East Coast, claiming dozens of lives and causing billions in damages to the US economy. Lower Manhattan at night, otherwise a hub of around the clock activity, was dark, silent, and flooded. That image, reminiscent…

Waste Management a Priority for C40’s African Cities

Ricardo Cepeda-Marquez, the Director of C40’s Solid Waste Initiative, finds C40’s African cities taking action — and eager to share knowledge to improve solid waste management. Following a successful C40 Mayors Summit in Johannesburg, the Director of C40’s Solid Waste Initiative, Ricardo Cepeda-Marquez and C40 Africa Regional Director Hastings Chikoko met with three of C40’s…

Infographic: C40 Cities Releases Landmark Research Revealing Expansion & Acceleration of Climate Actions in Megacities

At the C40 Mayors Summit in Johannesburg today, C40 Cities released Climate Action in Megacities 2.0, a landmark research report that demonstrates a clear trend of megacities expanding and accelerating their climate actions. Climate actions – like implementing energy efficiency standards for buildings or adding bus rapid transit lanes – aim to reduce greenhouse gas emissions and improve…

Mayors Voices: Lord Mayor Frank Jensen on Copenhagen as Europe’s Green Capital

*Editor’s note: Lord Mayor Frank Jensen of Copenhagen will be participating in the C40 Mayors Summit in Johannesburg this week, participating on a panel with UNFCCC Executive Secretary Christiana Figueres on ‘City Leadership and the International Climate Agenda.’ Copenhagen Launches Its Year As Europe’s Green Capital Frank Jensen, Lord Mayor of Copenhagen Despite freezing temperatures more than…

C40 Board President Mike Bloomberg Appointed United Nations Special Envoy for Cities and Climate Change

Michael R. Bloomberg, 108th mayor of New York City, and currently President of the Board of the C40 Cities Climate Leadership Group (C40) has been appointed to serve as Special Envoy for Cities and Climate Change to the United Nations. In this role, Bloomberg will work with United Nations Secretary-General Ban Ki-moon to foster further climate actions…

C40 Mayors highlight cities’ role in climate change at CGI Latin America

In December the Clinton Global Initiative Latin America convened a meeting of world leaders from the government, public and private sectors in Rio de Janeiro to highlight the region’s social and economic progress and identify areas of future opportunity. With the region’s rapidly growing urban population, the role of cities was a key topic of discussion at…

Bogota Charges Forward with Electric Taxis

As part of ongoing efforts to mitigate climate change and improve air quality, C40 city Bogota is rolling out the largest fleet of electric taxis in South America, including 50 new vehicles in the next few months. The new taxi system is part of a larger effort to utilize the country’s vast hydropower resources, while…

Buenos Aires’ “Green Agenda” – A Comprehensive Approach to Addressing Climate Change (English & Spanish)

As a C40 Mayor deeply committed to addressing climate change and reducing greenhouse gas emissions, I have been following with great interest the latest round of climate negotiations which concluded in Warsaw some weeks ago. The summit closed with a compromise deal establishing a timeline for discussions, and for governments to set out their targets…

Viva Buenos Aires! ‘Plan for Sustainable Mobility’ Wins Citizen’s Choice Award

The people have spoken and Buenos Aires has won the first ever “Citizen’s Choice Award” – a digital media campaign that asked the public to vote for their favorite project nominated in the 2013 C40 & Siemens City Climate Leadership Awards. Out of the 19 city-submitted projects that did not win an award, the public identified…

Mayors’ Voices: Mexico City Mayor Miguel Angel Mancera Espinosa, Ph.D. (In English and Spanish)

Mexico City won the Air Quality category at the inaugural C40 & Siemens City Climate Leadership Awards in September. Here Mayor Mancera gives us insight into PROAIRE, the city’s successful program to improve air quality. The C40 and Siemens recognition of the efforts undertaken by Mexico City to improve air quality is primarily an acknowledgement of the…

Rio Mayor Paes to succeed Mayor Bloomberg as C40 Chair

Yesterday at a press conference at New York City Hall, the C40 announced that Rio de Janeiro Mayor Eduardo Paes will succeed New York City Mayor Michael R. Bloomberg as C40’s Chair. Mayor Paes was elected to succeed Mayor Bloomberg as the new Chair of the C40 Steering Committee and Mayor Bloomberg has been asked to…