C40 Cities



1 Nov 2017

Prioritizing efforts in four areas could help cities achieve 90 to 100 percent of the emissions reductions needed by 2030.

Blog post

25 Oct 2017

C40 mayors' open letter and their fossil-fuel-free streets declaration to achieve 'green and healthy streets'.

Video interview

1 Dec 2016

The mayors of Bogotá, Cape Town, New York City, Paris, Portland and Seoul explain why climate change and social inequality must be tackled together.

Case studies

C40 offers a Case Study Library – making it easier than ever for city officials, researchers, and urban stakeholders to explore the growing collection of more than 500 unique, world-leading solutions taking place across C40 cities. These case studies are sourced from publications like the...


Deadline 2020 is the first significant routemap for achieving the Paris Agreement, outlining the pace, scale and prioritization of action needed by C40 member cities over the next 5 years and beyond.

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