C40 Cities

@c40cities.bsky.social

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A global network of city mayors delivering urgent climate solutions. Protecting the people and places we love. 🌳🌍🌆💚 http://www.c40.org/

Football terms for climate nerds Offside: missing your emissions target Penalty: A climate lawsuit Yellow card: A warning from the IPCC Red card: Building a new coal plant in 2026 VAR: Scientists checking online disinformation Hat-trick: Reducing fossil fuels, building resilience and making climate action equitable Own goal: Tax breaks for oil companies
A diverse group of people is gathered on a stage under a "City-Business Roundtable" sign. They are posing for a group photo at a "C40 Cities" event, dressed in business and casual attire. The backdrop includes a green and black digital screen.
An audience is seated in a modern conference room facing a speaker and a presentation screen. The screen displays five headshots with a topic about urban and regional planning. Large windows in the background reveal a cityscape.
A speaker at the lectern moderating an audience Q&A session with the four panel members seated on stage under a large presentation screen.
Mayor Anne Hidalgo speaking with her hand on her chest at a wooden lectern bearing a London School of Economics and Political Science (LSE) plaque.
A wide high-angle shot of a packed university lecture theater watching a climate transformation presentation and panel discussion on stage.
King Charles III shaking hands and sharing a warm smile with Yvonne Aki-Sawyerr, Mayor of Freetown, at an event inside an opulent room with red walls and gold-framed portraits.
Six panelists seated on stage during a Panel 1 session focused on urban regeneration and brownfield development, with an audience watching from the foreground.
A group photo of six panel speakers posing together on a stage in front of a large presentation screen displaying speaker profiles.
A close-up view across a boardroom table showing delegates, including Anne Hidalgo and Governor Eduardo Leite, reviewing notes and listening during a meeting.
Attendees seated along a long dark conference table equipped with microphones and nameplates during the CHAMP Subnational Advisory Council meeting, with a digital presentation screen visible in the background.
A group photo of eleven professional delegates standing in a row in front of a patterned abstract wall next to a green CHAMP banner.
The Mayor of Milan speaks on a panel at London Climate Action Week. He is wearing a suit and holding a microphone and sat with other climate experts. Behind is a yellow background with C40 Cities and London Climate Action Week signage. Photo courtesy of Bloomberg Philanthropies.
A stage panel discussion at London Climate Action Week 2026, featuring four participants seated in armchairs in front of a bright yellow arched backdrop under historic gothic stained-glass windows.
A promotional graphic for the "Yearly Offer of Action" initiative titled "Medellín Restores Its Waterways," featuring a portrait of Mayor Federico Gutiérrez against a scenic backdrop of the city and surrounding mountains.
A speaker stands at a white podium on a stage with bright yellow arched backdrops and empty armchairs, set inside a grand hall featuring historic gothic stained-glass windows.
A wide-angle view of a high-level roundtable meeting inside a grand, historic room with gothic stained-glass windows, where delegates are seated around a massive wooden conference table.
A group portrait of international climate leaders and delegates, including UN Secretary-General António Guterres, London Mayor Sadiq Khan, and Freetown Mayor Yvonne Aki-Sawyerr, posing together on a red carpet inside a historic stone hall.
A promotional graphic featuring two climate action quotes from UN Secretary-General António Guterres, alongside a cutout photograph of him speaking at a podium against a green park backdrop. “The Earth's tipping points are like objects in a car mirror. They are far closer than they appear. We have the enormous opportunity - and responsibility - to finally turn the page on fossil fuels - and write a future powered by renewables and rooted in climate justice. This is our moment of choice. Our moment of truth. Our moment of opportunity. Let's seize it.”
A promotional graphic featuring a quote on climate action from Simon Stiell, Executive Secretary of the UNFCCC, alongside a portrait photo of him against a colorful London cityscape background. “Subnational governments are demonstrating how climate ambition can be translated into tangible results for people and communities. This kind of collective yearly implementation across all levels of government is essential to bolstering climate action and achieving the goals of the Paris Agreement.”
Mayors and climate experts stand in front of a white backdrop featuring the C40 Cities logo.
A group photo of seven members of the C40 Steering Committee, including London Mayor Sadiq Khan, standing in a line and smiling in front of a white backdrop patterned with the "C40 CITIES" logo.
A stage panel discussion at the Climate Innovation Forum 2026, featuring three men in business suits seated in armchairs against a vibrant teal backdrop. The screen behind them reads "Building International Cooperation for Implementation" and lists the moderator as Nick Mabey and the speakers as Selwin Hart and André Corrêa do Lago. The panelist on the left is speaking into a microphone while the others listen.
An aerial photo of a Mexico City street, overlaid with a graphic of a white electric car connected to a lightning bolt symbol. Text outlines the city's programme to help taxi drivers switch to clean energy.
A photo of a beachside cityscape in Rio de Janeiro, overlaid with a graphic of a pink hand holding an electric vehicle charging plug. Text details Rio's launch of fast-charging hubs and plans for expansion.
An illustration of a bustling, colourful city street filled with diverse people, an electric car at a charging station, a delivery truck, an e-scooter, and a cyclist. Text reads: "The way we power our cities is changing. 5 cities prioritising charging for electric taxis, ride-hail, and deliveries. Artwork by Erin Dwia."
Infographic titled "Athens, Greece" showing a narrow pedestrian street lined with outdoor cafe seating under a lush canopy of trees. The text states the city is implementing heatwave warnings and constructing green cooling spots for at-risk residents.
Infographic titled "Milan, Italy" showing a modern outdoor shade structure with benches being installed near a crane truck and workers. The text notes the city converted a schoolyard into a cool gathering space and plans further pedestrian shading.
Graphic titled "Freetown, Sierra Leone" featuring an aerial view of the The text details how the city is turning market waste into energy, installing renewable cool rooms, and creating a heat response taskforce.
graphic for "Global Heat Action Day" featuring a silhouette of a modern city skyline, including an ultra-tall skyscraper, behind desert sand dunes under a hazy sky. Text reads: "6 cities keeping people safe as temperatures rise."