C40 is a network of nearly 100 mayors of the world’s leading cities who are working to deliver the urgent action needed right now to confront the climate crisis and create a future where everyone, everywhere, can thrive. Mayors of C40 cities are committed to using a science-based and people-focused approach to limit global heating in line with the Paris Agreement and build healthy, equitable, and resilient communities. Through a Global Green New Deal, mayors are working alongside a broad coalition of representatives from labour, business, the youth climate movement and civil society to go further and faster than ever before. The current co-chairs of C40 are Mayor of London Sadiq Khan and Mayor of Freetown Yvonne Aki-Sawyerr. Three-term Mayor of New York City Michael R. Bloomberg serves as President Emeritus of the Board. C40’s work is made possible by our strategic funders: Bloomberg Philanthropies and Realdania.
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C40 Cities Questions
The C40 Cities annual revenue was $28.5 million in 2026.
Luke Upchurch is the Managing Director - Communications of C40 Cities.
385 people are employed at C40 Cities.
The NAICS codes for C40 Cities are [92, 9251, 925, 92512].
The SIC codes for C40 Cities are [95, 953].
Top C40 Cities Employees
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25
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David Walsh
General Counsel at C40 Cities
Sitges, CT, ES12 -
Stephen Green
Head of IT at C40 Cities
United Kingdom2 -
Julie Ciardullo
Head of Strategy, C40 x GCoM Joint Programme at C40 Cities
Los Angeles, CA, US22 -
Emily Barber
Head of Programmatic Communications at C40 Cities
Washington, DC, US24 -
Samantha Poultney
Head of FP and A at C40 Cities
Newmarket, GB1
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