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On the first day of COP21, mayors and citizens of C40 cities urge nations to act on climate change

As the global climate talks get underway in Paris today, the world’s great cities continue to show why they are an integral part of the conversation on climate change. In a powerful message to world leaders, hundreds of thousands of people – by some estimates 785,000+ – from around the world took to the streets…

Urban Gardens Frame Life in Jakarta

RUSUN MARUNDA, Jakarta–I grew up in east Tennessee where food is love and the Farmer’s Almanac is mandatory reading. A deep-rooted love for digging in the dirt and watching a seed transform to seedling to fruit is something I carry with me always. So when I came across Pak Bambang diligently tending to his garden…

Jakarta Family Finds Housing Stability Is Costly

RUSUN MARUNDA, Jakarta– Born in Central Java, Ibu Mawar*, 46, moved to Indonesia’s capital city with her parents when she was a young child. Regardless of the struggles of relocating and building a new life in the big city, she enjoyed a typical childhood living along the banks of the Cisadane River. While attending school and playing…

From Copenhagen to Paris, cities and mayors are leading the way on climate action

The world’s leading mayors have doubled climate action since COP15 in Copenhagen, and set an example for cooperative action between nations ahead of COP21. Today, the C40 Cities Climate Leadership Group (C40) and research partner Arup released Climate Action in Megacities (CAM 3.0), a groundbreaking and definitive assessment of how the world’s leading mayors have…

100 Reasons Cities are Winning the Climate Fight 

C40 Cities launch Cities100 publication in partnership with Sustainia and Realdania. As we approach the UN climate Change Conference, COP21, in Paris this December, the focus will be on national governments to reach a binding global climate deal. But Cities100 is here to remind us that city leaders are not waiting for national level changes.…

Polisdigitocracy: Digital Technology, Citizen Engagement and Climate Action – A New C40-Arup Report

An op-ed by Eduardo Paes, C40 Chair and Mayor of Rio de Janeiro In 2013, widespread protests brought Rio de Janeiro to a halt. People took the streets calling for better health and education, for an end to corruption and for their voices to be heard and to matter. Rather than trying to arrest or quiet…

It Takes Time.

I slip off my shoes at the door and take a seat on the floor of her living room. It is maybe 10 degrees cooler inside than the 90+ degree (F) heat outside. She offers water and a welcoming smile. I ask how long she has lived in her current home; where she lived before;…

Vice President Biden calls on more U.S. cities to commit to the Compact of Mayors

While speaking at the National League of Cities Congress, Vice President Biden announced that 83 U.S. cities have committed to the Compact of Mayors – leaving just 17 cities to go to fulfill the White House challenge for 100 U.S. cities to commit to the Compact before the start of the COP21. With less than…

Drawing Out a City: The Basics.

Whether documenting or depicting, we make certain assumptions, even if only temporarily. To draw a city–to construct a city over time–essential structural elements are often the starting point. Places for public gathering, resource and transportation hubs, and (most often) natural elements–rivers, lakes, oceans, and mountains– lay the framework for the city. These points, nodes, or primary…

C40 kicks off global pro bono ad campaign in London’s iconic Piccadilly Circus

Today, the C40 Cities Climate Leadership Group (C40) debuted its first ad for #CitiesAreKey, a global pro bono advertising campaign designed to underscore the leadership role mayors and urban citizens are playing to tackle climate change on the road to the international climate talks in Paris, and beyond. To kick off the campaign, a 30-second…

Portland Mayor Charlie Hales explains why climate action is about both planet and people

Pope Francis, speaking in an incredible 500-year-old building at the Pontifical Academy of Sciences in Vatican City this summer, told me and 60 other mayors that addressing climate change is a moral imperative for humanity. That was a moving experience for city leaders. When the network of C40 cities gathered for a summit in Johannesburg…

Stockholm Mayor Karin Wanngård on the journey to becoming Climate Positive

We have set the ambitious goal for the City of Stockholm to be – not just climate neutral – but fossil fuel free by 2040. We are fully aware that the city must excel in all aspects to reach our goal. Stockholm is already an acknowledged global climate leader, where energy efficiency and local production…

Sustainable Seafood Businesses Tackle Food Deserts with an Ancient Farming Technique

One of the most interesting trends to emerge from the Fish 2.0 business competition is the increasing use of aquaponics, which combines fish farming (aquaculture) with growing plants in water (hydroponics). This is nothing new—people have been practicing aquaponics for centuries, in the Aztecs’ floating crop islands, the rice paddies of Asia and elsewhere. What’s…

Expert Voices: Oliver Wise, City of New Orleans Analytics Director on the power of open data

At the recent Data for Good Exchange, Oliver Wise, Analytics Director for C40 city New Orleans talked about how the city is using open data platforms to drive economic recovery post Katrina and enhance climate resiliency. Part of this effort included developing an app called “Blight Status,” which uses open data to track progress and results in…

One third of the world’s remaining safe carbon budget could be determined by urban policy decisions in the next five years

The C40 Cities Climate Leadership Group (C40) announced a new report today, which demonstrates that urban policy decisions before 2020 could determine up to a third of the remaining global carbon budget that is not already ‘locked-in’ by past decisions. Existing research has shown that investing in low carbon infrastructure in the next five years…