Check out C40 announcements and activities at London Climate Action Week 2025, taking place in London, between 21-29 June 2025
News, announcements and updates from C40 Cities and mayors at:
- Urban 20 (U20) Summit in Rio de Janeiro, Brazil
- COP29 in Baku, Azerbaijan
Check out C40 announcements and activities at Climate Week NYC, taking place in New York City from 22–29 September 2024.
Learn about all C40 events, activities and announcements at COP28, held in Dubai, UAE, from 30 November to 12 December 2023.
Read C40’s key takeaways from the 27th United Nations Climate Change Conference (COP27).
The C40 World Mayors Summit is our triennial climate action conference organised in partnership with a C40 member city. The 2022 Summit, hosted by the City of Buenos Aires from 19–21 October, was a hybrid in-person and virtual event.
The C40 Cities Bloomberg Philanthropies Awards are a celebration of the most ambitious, impactful and inclusive global climate projects led by cities.
C40’s event at COP26 featured mayors and thought leaders from around the world. It addressed ways to achieve a sustainable and equitable recovery from the pandemic and advance C40’s vision of a green and equitable future.
Check out all C40 news, events and resources for the 2021 UN Climate Change Conference (COP26).
A virtual event was hosted during Climate Week NYC to showcase the coalition of stakeholders working together to accelerate the transition to clean energy in C40 cities and beyond.
The C40 World Mayors Summit in Copenhagen gathered a global coalition of leading cities, businesses and residents to showcase the radical and ambitious climate action our planet needs to create the future we want.
