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.
Today, C40 and research partner Arup released Climate Action in Megacities (CAM 3.0), a definitive assessment of how the world’s leading mayors have taken on the urgent challenge of climate change. Since the last major COP in Copenhagen, C40 cities have taken 10,000 climate actions – a doubling of actions in just six years – and have committed to reduce their CO2 emissions by 3 Gt CO2 by 2030, equivalent to the annual carbon output of India.
On behalf of all C40 cities around the world, C40 Chair and Mayor of Rio de Janeiro Eduardo Paes issues a message of solidarity, unshakeable friendship and condolences to Mayor Hidalgo and the people of Paris.
As COP21 in Paris draws ever closer, cities are emerging as a bright spot and, consequently, an area of focus for researchers and politicians alike. Learn why cities are emerging in the fast lane on the #RoadtoParis and #COP21.
C40 networks facilitate dialogue, cooperation, and information exchange amongst city officials. The result is that cities' climate actions to reduce GHGs and climate risks are bolder, more impactful, and implemented faster with less resources than if they were to go it alone. No other organisation connects city staff across 50+ countries, 20 time zones and 26 languages to accelerate local action with major global impact.
"The evidence is clear that [C40's] networking strategy is working," says C40 Board President and UN Special Envoy for Cities & Climate Change Michael R. Bloomberg in the most recent issue of Foreign Affairs magazine, where he writes about city climate action as a catalyst for public health and economic growth.
As C40 marks its ten-year anniversary, we are pleased to share a new “10 Years of Results” booklet. We encourage you to read and share these highlights on what C40 has accomplished, as well as our vision for a bright, urban future.
The World is Watching Cities
As COP 21 approaches, the world's media has increased its focus on cities -- and for good reason. Cities are at the center of climate action, having enacted more than 10,000 measures, policies, and programmes to address climate issues since C40 started measuring.
As a primer to the pivotal meeting in Paris, we're showcasing research and stories that help explain why a global agreement on climate change matters, and why cities are so important to the success of any agreement.
C40 and Arup have released the third installment of their groundbreaking research. Cataloging 10,000 actions from the world's leading cities, the new report demonstrates the ability of mayors to share knowledge across geographic, political and economic boundaries: 30 percent of climate action measured was a result of city-to-city collaboration. It also shows that collaboration is accelerating the rate at which cities are acting – more than half (51 percent) of climate action is happening today at a city-wide scale, up from just 15 percent in 2011.
Ahead of the Paris climate talks, Mexico City Mayor Miguel Angel Mancera explained why nations should begin to look to their cities for leadership and direction. Read more in a recent story in The Guardian.
Mayors Boris Johnson (London), Frank Jensen (Copenhagen), Stian Berger Røsland (Oslo), and Karin Wanngård (Stockholm) urge fellow European leaders from national governments and supranational authorities to build a solid foundation for low-carbon economic growth and climate resilience. They write, "Cities are already driving the transition to a better future. We need to see the same level of ambition at the national and European levels."
C40 debuted its first ad for #CitiesAreKey, a global pro bono advertising campaign designed to underscore the leadership role that mayors and urban citizens are playing to tackle climate change on the road to the international climate talks in Paris, and beyond.
The campaign kicked off with an animated video broadcast on a digital billboard in London’s Piccadilly Circus and recently expanded to New York's Times Square.
Mayors and local leaders in power today have a major role to play in determining whether or not we have a cost-effective and, therefore, realistic path to a climate safe world.
A new report released by C40 demonstrates that urban policy decisions made before 2020 could determine up to a third of the remaining global carbon budget that is not already ‘locked-in’ by past decisions.
The World's Leading Philanthropic Organizations are Investing in C40
Michael R. Bloomberg, founder of Bloomberg Philanthropies, a C40 strategic funder, and UN Secretary General’s Special Envoy for Cities and Climate Change, congratulates C40 on 10 years of results. As President of the C40 Board, Bloomberg supports and highlights the climate action that cities are taking and the critical role that mayors can play in helping nations create ambitious carbon reduction commitments.
Philanthropy is evolving. More and more, philanthropic investments are data-driven and results-oriented, which means limited resources are flowing towards organizations with the biggest impact. Enter C40. As a network of the world's megacities, C40 is positioned to harness philanthropic investments to improve the lives of over 600 million people -- and as those ideas spread and germinate in cities around the world, they'll impact the majority of the global population.
"Through Polisdigitocracy – the use of open data, social media and digital technology to drive citizen engagement – we must listen, renew legitimacy and turn formal consultation into constant collaboration. Polisdigitocracy has incredible potential to help our cities engage and excite citizens to achieve our common goals." Mayor Eduardo Paes.
“We can no longer postpone actions against the consequences of climate change, which we already are feeling,” says Eduardo Paes, mayor of Rio de Janeiro...Rio, like other cities in the global south, has experienced a range of recent extreme weather events, including avalanches due to sudden violent rains and a continuing drought that is stressing water supplies across Brazil.
Mayor of Rio de Janeiro and Chair of C40, Eduardo Paes, attended C40's tenth anniversary event in New York with President Bill Clinton and Michael Bloomberg.
Paes' speech reinforced the importance of cities on the road to Paris, and asked attendees to support the Climate Fund, an initiative to help cities finance low-carbon actions. Learn more about C40's anniversary.
"People live in cities, not states or nations, so they have to be taken into consideration in the agreements. As mayors, we are closer to people than heads of state. Around the world, mayors have taken the lead and shown the actions through networks like C40." - Mayor Paes, Chair of C40
As C40 Chair, Rio de Janeiro Mayor Eduardo Paes is working on behalf of all C40 Mayors to carve a new role for city leaders on the global stage. Above, Mayor Paes meets with China's Premier Li Keqiang to discuss the advancement of climate action in Chinese cities.