@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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  • Following3.3K
  • Followers111K
11.3KMedia
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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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 ⬇️🧵
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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.
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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
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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

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
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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.
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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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"Before 2023, we only had about 14 days where the heat was over 105°. This August alone, we had 17 days in a row over 105°." - Mayor of Miami Eileen Higgins on the urgent need to act to help people stay safe as temperatures rise.
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“Spaces like this provide incredible guidance. We’ve benefited so much from @ClimateMayors and C40’s infrastructure.” - Mayor Wu speaks with @EricGarcetti at Climate Mayors Leadership Forum on the benefits of working with other city mayors.
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At @ClimateMayors Leadership Forum at #ClimateWeekNYC, @MayorGallego of Phoenix and Mayor @JustinMBibb of Cleveland discussed energy, data centres, and growing their economies while protecting people from rising costs ⬇️
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“Data centres can afford to give back to our community. If we all fight for sustainability in our communities then we’re more likely to get a great outcome.” - @MayorGallego.
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“We need guardrails to protect our residents and their energy costs.” - Mayor @JustinMBibb on exploring the sustainable, beneficial growth of data centres.
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