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C40 Cities

@c40cities

A network of city mayors delivering urgent climate solutions. Protecting the people and places we love. 🌳🌍🌆💚

 Global
c40.org
Joined August 2010
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Photo by C40 Cities (@c40cities)Photo by C40 Cities (@c40cities)Photo by C40 Cities (@c40cities)Photo by C40 Cities (@c40cities)Photo by C40 Cities (@c40cities)Photo by C40 Cities (@c40cities)Photo by C40 Cities (@c40cities)Photo by C40 Cities (@c40cities)Photo by C40 Cities (@c40cities)Photo by C40 Cities (@c40cities)
Brazil is showing what climate action looks like 🇧🇷 Cities are bringing climate action into public budgets and building on the momentum of COP30. c40.org/news/brazilian-citie…
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Huge opportunities await businesses investing in green tech and infrastructure. In @ClimateHome, @LordMayorMelb Nick Reece & Mayor of Renca @cn_castro detail why C40 cities are generating a green investment boom. climatechangenews.com/2026/1…
A quote from the Lord Mayor of Melbourne and the Mayor of Renca that reads: “When we talk about the green economy, we often think nationally... but much of the investment needed to deliver the green transition will be decided closer to home – in our cities.”

ALT A quote from the Lord Mayor of Melbourne and the Mayor of Renca that reads: “When we talk about the green economy, we often think nationally... but much of the investment needed to deliver the green transition will be decided closer to home – in our cities.”

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Mayor Sadiq Khan's transformation of Oxford Street shows what is possible when mayors put people at the heart of their cities.
A background shows an image of Oxford Street with Union Jack flags. The text reads: Today, Oxford Street has been transformed into a place for people, not traffic. The move creates a safe and spacious shopping hub in time for the busiest retail period of the year.

ALT A background shows an image of Oxford Street with Union Jack flags. The text reads: Today, Oxford Street has been transformed into a place for people, not traffic. The move creates a safe and spacious shopping hub in time for the busiest retail period of the year.

Text reads: "And it doesn't stop there... Ongoing transformation will see more trees planted, more seating, two public squares." Against a background image of people walking in Oxford Street

ALT Text reads: "And it doesn't stop there... Ongoing transformation will see more trees planted, more seating, two public squares." Against a background image of people walking in Oxford Street

A quote card from Mayor of London Sadiq Khan reads: "I'm hugely excited to see my bold vision for Oxford Street coming to life from today. Revitalising Oxford Street will boost jobs and economic growth in the capital, unlock the full potential of this key part of the West End and help build a better, greener and more prosperous London for everyone"

ALT A quote card from Mayor of London Sadiq Khan reads: "I'm hugely excited to see my bold vision for Oxford Street coming to life from today. Revitalising Oxford Street will boost jobs and economic growth in the capital, unlock the full potential of this key part of the West End and help build a better, greener and more prosperous London for everyone"

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Londonmaxxing at its finest. Under the leadership of C40 Co-Chair and @MayorofLondon, one of the world's most famous shopping streets is putting people first. @SadiqKhan
Text shows: Good news: Oxford Street in London is now traffic-free. Background image of Oxford Street

ALT Text shows: Good news: Oxford Street in London is now traffic-free. Background image of Oxford Street

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Water = life 💧 By introducing clean drinking water kiosks in underserved communities, C40 Co-Chair and Mayor of Freetown @yakisawyerr is tackling climate challenges, creating new jobs and protecting people from unsafe water. @FCC_Freetown
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More trees, cooler streets and a city better prepared for extreme heat. 🌳 Through ‘Freetown the Treetown’, C40 Co-Chair @yakisawyerr is showing how a simple solution can make a big difference in the fight against rising temperatures in Freetown, Sierra Leone. @FCC_Freetown
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Transforming the Seine River and making it clean and swimmable was one of the boldest moves Paris took to tackle the climate crisis. Hear from the Mayor of Paris, Emmanuel Gregoire, about how restoring the Seine is future-proofing the city for generations to come.
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🇲🇾 Kuala Lumpur is helping communities stay cool as temperatures rise. 🇮🇳 Bengaluru is turning rooftops into a major source of clean energy. Explore the progress and learn more about the data in our 2025 annual report: bit.ly/C40AnnualReport2025
Image from C40 Cities (@c40cities)
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🇨🇳 Shenzhen is making global shipping greener with cleaner energy at ports. 🇧🇷 Curitiba is improving waste services six years ahead of its target timeline. 🇺🇸 New York City is cutting food emissions by serving more plant-based meals across hospitals.
Image from C40 Cities (@c40cities)
Image from C40 Cities (@c40cities)
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🇬🇧 London is cutting air pollution and making clean air the norm. 🇪🇹 Addis Ababa is accelerating the shift to electric vehicles across the city.
Image from C40 Cities (@c40cities)
Image from C40 Cities (@c40cities)
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GOOD NEWS: Cities are taking bigger, bolder steps to tackle the climate crisis. Across C40 cities, climate action is already delivering real results. From cleaner air and greener transport to cooler neighbourhoods and more renewable energy ⬇️🧵
Image from C40 Cities (@c40cities)
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Cities are already feeling the impact of a hotter, more unforgiving climate. From opening public areas 24/7 for people to cool down to creating more shade and green spaces, cities like Paris are finding practical ways to protect residents from extreme heat. @egregoire
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Listen up 🗣️🗣️🗣️
A collection of graphics following the viral "If your bestie..." internet trend. Each image uses retro WordArt headers ("Listen up if your bestie..."), Comic Sans bullet points describing helpful qualities, and colourful standard WordArt reading "that's not your bestie," revealing an environmental subject at the bottom: "Listen up, if your bestie gives you energy, loves sunshine, lowers energy bills" that's not your bestie, that's a solar panel." alongside a solar panel graphic.

ALT A collection of graphics following the viral "If your bestie..." internet trend. Each image uses retro WordArt headers ("Listen up if your bestie..."), Comic Sans bullet points describing helpful qualities, and colourful standard WordArt reading "that's not your bestie," revealing an environmental subject at the bottom: "Listen up, if your bestie gives you energy, loves sunshine, lowers energy bills" that's not your bestie, that's a solar panel." alongside a solar panel graphic.

Listen up if your bestie... - makes everything look better - is super organised - protects biodiversity that's not your bestie, that's an urban planner

ALT Listen up if your bestie... - makes everything look better - is super organised - protects biodiversity that's not your bestie, that's an urban planner

Listen up, if your bestie... tracks pollution trends makes data-driven decisions directs clean-air investments towards disproportionately affected communities that's not your bestie that's an air quality monitor

ALT Listen up, if your bestie... tracks pollution trends makes data-driven decisions directs clean-air investments towards disproportionately affected communities that's not your bestie that's an air quality monitor

Listen up if your bestie - is really quiet - keeps people moving - is cutting toxic pollution that's not your bestie that's an electric bus

ALT Listen up if your bestie - is really quiet - keeps people moving - is cutting toxic pollution that's not your bestie that's an electric bus

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Congratulations to @MayorofLondon @SadiqKhan, Bogotá mayor @CarlosFGalan and @NYCMayor @ZohranKMamdani and to C40 President Emeritus @MikeBloomberg for being recognised on The Independent's Climate 100 list. independent.co.uk/climate-ch…
The Independent Climate 100 List 2026

The Independent Climate 100 List 2026

Back for its third year, The Independent is proud to publish its list of the world’s leading environmentalists – marking the campaigners, change makers and innovators who are making a positive and...

independent.co.uk
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Over the last 4 years, global emissions rose by 2%. Meanwhile, C40 cities cut emissions per person by 3.5%. Cities have the power to drive change. Dive into the work mayors and cities are putting in every day to protect the people and places we love: bit.ly/C40AnnualReport2025
Image from C40 Cities (@c40cities)
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36 cities in C40’s Cool Cities Accelerator are helping millions of people stay safe as temperatures rise. In New York, cooling pop-ups are being expanded across all five boroughs. In Miami, Mayor Eileen Higgins is using data from heat sensors to help improve heat safety.
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Extreme weather is being felt in cities everywhere, and sessions during #ClimateWeekNYC are exploring how cities can get prepared: Phoenix is expanding shade, Austin is making homes cooler and safer, and New York City is improving access to essential cooling for tenants.
Image from C40 Cities (@c40cities)
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Governor of California @GavinNewsom speaking at the United Nations on the power of local climate action.
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Mayor of Boston & C40 Vice-Chair Michelle Wu speaking at the United Nations on the impact and importance of taking climate action every day.
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Mayor of Freetown & C40 Co-Chair @yakisawyerr speaking at the United Nations on why cities matter in the fight against climate breakdown.
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