C40 is a network of the world’s megacities committed to
addressing climate change. C40 supports cities to collaborate
effectively, share knowledge and drive meaningful, measurable
and sustainable action on climate change.
Photo: Kois Miah
Around the world, C40 Cities connects 96 of the world’s greatest cities to take
bold climate action, leading the way towards a healthier and more sustainable future.
Representing 700+ million citizens and one quarter of the global economy, mayors of
the C40 cities are committed to delivering on the most ambitious goals of the Paris
Agreement at the local level, as well as to cleaning the air we breathe.