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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.

C40 Latin American Mayors Forum Showcases Region’s Bold Climate Leadership

Today C40 held its first-ever Latin American Mayors Forum, hosted by Buenos Aires Mayor Mauricio Macri and attended by more than 15 mayors and vice-mayors from the region. During the Forum, it was announced that 20 Latin American mayors have joined the Compact of Mayors, and 20 global C40 cities have committed to pursuing clean buses.…

C40 Launches City Climate Change Hazard Taxonomy for Public Comment

Today, at the UNISDR World Conference on Disaster Risk Reduction, C40 officially launched for public comment the City Climate Hazard Taxonomy, a structured description of the key climate hazards that cities are facing. The Taxonomy was developed by C40 and ARUP with funding from Bloomberg Philanthropies. Cities are key actors in building climate resilience because…

C40 Membership Grows to 75 Global Cities

C40 is pleased to welcome Amman, Durban, Jaipur, Quito, and Salvador to its global network of cities committed to tackling climate change and increasing urban resilience. These five cities bring C40’s overall membership to 75 cities, a key milestone in the organisation’s expansion efforts and a testament to the success of city-to-city collaboration on climate…

C40 Chair, Rio de Janeiro Mayor Eduardo Paes: “cities have committed actions – now we need funds”

Editor’s Note: 2015 marks the 10-year anniversary of C40 Cities Climate Leadership Group. To celebrate these 10 Years of Results, we will be featuring the voices of C40 principals, partners and other thought leaders throughout the year. I have some very important anniversaries to attend to this year. March 1st marks the 450th anniversary of the…

Mayors Voices: Boston Mayor Marty Walsh on New Climate Action Plan

The City of Boston has long been a leader on climate action. Since 2005, we’ve been tracking our greenhouse gas emissions, from both municipal operations and the entire city. And we’ve been making great progress. Citywide emissions are down 17 percent, while municipal emissions are down 27 percent since 2005. We are well on our…

10 Years of Results: C40 By the Numbers

2015 marks the 10-year anniversary of C40 Cities Climate Leadership Group. To celebrate these 10 Years of Results, we will be sharing our favorite lists of 10 throughout the year. 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. Find some…

Mayor’s Voices: Buenos Aires Mayor Macri, Host of the C40 Latin American Mayors Forum, highlights the Leadership of Cities on the Road to Paris 2015

The C40 Latin American Mayors Forum in Buenos Aires on 27 March 2015, will be a critical opportunity for city leaders to address one of the most important development challenges of the 21st century: how rapidly growing urban areas can be sustainable and liveable for their citizens, and inspirational to the world on climate action.…

Celebrating 10 Years of Results

Mark Watts, C40 Executive Director kicks off our 10th anniversary year. In 2005, then-Mayor of London Ken Livingstone brought together 18 mayors from some of the world’s largest urban centers to determine how they could work together to cut carbon emissions and lead on global climate action. It was prompted by Mayor Livingstone’s own efforts…

Mayors Voices: The Hon. Robert Doyle, Lord Mayor, Melbourne on the city’s award winning citizen engagement efforts

Like every other city in the world, Melbourne is facing the impacts of population growth, environmental change and financial constraints. The decisions we make now will affect our community well into the future. These are important issues and no government is adopting a ‘business as usual’ approach to the allocation and prioritisation of resources within…

C40 Voices: Mark Watts, Executive Director on key elements to a sustainable low carbon city

At the recent ‘Copenhagen – Paris: A roadmap to COP21’ event, C40 Executive Director Mark Watts shared the following remarks. Cities are where the battle to prevent climate change will be won or lost. Indeed, the pattern of development followed by a small number of leading cities will likely determine whether or not it is…

Mayors Voices: Los Angeles Mayor Eric Garcetti on How Cities Can Help U.S. & China Meet Climate Goals

United States President Barack Obama and Chinese President Xi Jinping recently signed an historic deal setting the groundwork for both countries to make significant strides to halt global climate change*. The deal represents unprecedented collaboration between the two nations on climate, yet the agreement does not outline a comprehensive plan to achieve the agreed-upon reductions…

Year in Review 2014: Cities Take Center Stage in Global Climate Conversation

2014 saw cities take their place as major players in the global fight against climate change, widely recognized as a critical part of the solution and, particularly, as key partners to nations working to forge a new universal climate agreement in Paris 2015. For C40, this year’s highlights include the addition of seven new member…

Expert Voices: John Elkington, co-founder and Executive Chairman of Volans, on why city mayors are the ambassadors for the future

An ambassador, said Sir Henry Wotton, who practiced the art in the 1600s, “is an honest gentleman sent to lie abroad for the good of his country.” Catchy, but three things strike me as questionable about this attempt to distil the essence of diplomacy. First, the foreign services of a growing number of nations are…

First Global Standard Launched to Measure City Greenhouse Gas Emissions & Support Compact of Mayors

Today at COP20 in Lima, C40 and partners World Resources Institute (WRI) and ICLEI – Local Governments for Sustainability (ICLEI) released the first widely endorsed standard for cities to measure and report their greenhouse gas (GHG) emissions, called the Global Protocol for Community-Scale Greenhouse Gas Emission Inventories (GPC). By providing a framework for credible emissions…

C40 Voices: James Alexander, Head of Finance & Economic Development Initiative, on Toronto’s Innovative Investment in Urban Climate Solutions

Sharing good practice in city green funds is one areas of focus for C40’s Sustainable Infrastructure Finance Network.  Following webinars featuring the cities of Amsterdam, London and New York, the Network recently hosted Julia Langer, Chief Executive of Toronto Atmospheric Fund (TAF). Julia presented the Fund’s fascinating work of using a small endowment to create,…