Overview

C40 is a global network of nearly 100 mayors of the world’s leading cities that are united in action to confront the climate crisis. Mayors of C40 cities are committed to using an inclusive, science-based and collaborative approach to cut their fair share of emissions in half by 2030, help the world limit global heating to 1.5°C, and build healthy, equitable and resilient communities. C40 supports mayors to do this by:

• Raising climate ambition through 1.5°C climate action plan support, high-impact accelerators and fostering innovation. 
• Building equitable and thriving communities via global and regional programmes.
• Building a global movement through robust international advocacy and diplomacy.
• Scaling up climate action and sharing best practices across high-impact sectors.
• Facilitating access to finance for investment in green jobs and projects that improve resilience in cities.

The C40 Knowledge Hub is a resource for cities wanting to act on climate change. It is designed for every city, regardless of C40 membership. We use ‘cities’ as shorthand for an urban municipal government of any size and in any country. If you work for a city – small or large – this site is for you. The primary goal of the Knowledge Hub is to equip city practitioners and policymakers with the practical information and tools they need to drive climate action locally. We identify tried-and-tested approaches, practical guidance, and insights and experience from cities already working on climate issues, and we share them in formats designed to be accessible and digestible.