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A network of city mayors delivering urgent climate solutions. Protecting the people and places we love. 🌳🌍🌆💚
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Recent posts
Meet the mayors protecting the people and places we love. 💚 🌎
04 Nov 2025
Week 1 at COP31. ⭐
World leaders are in Türkiye for #COP31 to discuss the future of climate action.
Mayors are on the ground to support national governments and showcase the climate action they are already implementing in their cities.
13 Nov 2026
At #COP31, @mayorofldn and C40 Co-Chair, @sadiq Khan, highlighted Breathe Cities as proof that global partnerships work. 🌍
Delivered by @bloombergdotorg, @c40cities and Clean Air Fund, Breathe Cities is working with city leaders to deliver cleaner air for almost 90 million people.
13 Nov 2026
“We’re not just talking about change, we’re delivering it too.”
Calling for stronger support for local leaders, @Mayorofldn and C40 Co-Chair, @Sadiq Khan, is at COP31.
He’s showcasing the work city mayors are doing right now, and asking for the ongoing help they need to protect residents from the growing impacts of the climate crisis
12 Nov 2026
Words of wisdom at COP31 from @mayorofldn @sadiq and @antonioguterres 👏
12 Nov 2026
At #COP31 in Antalya, Türkiye, the focus is on global climate action, but cities remain the frontline defence.
Mayors are essential for delivering the actual solutions needed to protect millions of people from intensifying climate impacts.
As Brazil passes the baton to Türkiye for COP31, the focus remains firmly on turning international commitments into real-world action.
As COP30 CEO Ana Toni highlighted, local governments are essential to making that happen.
09 Nov 2026
⭐ The Yearly Offer of Action is back, and more mayors are involved than ever before.
From cleaner energy to greener public spaces, cities around the world are pledging actions to deliver on climate goals.
Through the Yearly Offer of Action, C40 and @mayors4climate cities are turning climate targets into real results year after year.
09 Nov 2026
Brazil is showing what real climate action looks like. 🇧🇷🌴☀️
Through the Brazil Mutirão Program, more than 50 Brazilian cities and states are building on the momentum from COP30 and advancing climate projects with support from @c40cities and @mayors4climate.
Cleaner buses. Less organic waste in landfills. Better planning for floods, heat and other climate risks.
05 Nov 2026
C40 Cities has set out an ambition for all 97 of our member cities to have effective early warning systems and emergency preparedness plans in place by the end of 2027 to help protect millions of people from extreme weather.
Our aim is to make early warning systems a basic standard of protection for people living in some of the world’s largest cities, ensuring residents receive timely alerts about approaching dangers and that local authorities have practical plans in place to protect lives, homes, and livelihoods.
To help accelerate this, the mayors of Curitiba, Paris, Quezon City, Cape Town, Miami, and Mumbai have established a new C40 Mayoral Taskforce on Super El Niño and Extreme Weather to strengthen cities’ responses to extreme weather and share proven solutions.
02 Nov 2026
How climate-friendly are the towns and cities in your favourite shows and films? 🌃🌳
#worldcitiesday
01 Nov 2026
Scary movies made scarier
🎃👻
28 Oct 2026
Londonmaxxing at its finest.
Under the leadership of the C40 Co-Chair and @mayorofldn, one of the world's most famous shopping streets is putting people first.
Mayor @Sadiq Khan's transformation of Oxford Street shows what is possible when mayors put people at the heart of their cities.
26 Oct 2026
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