Any city in the world is eligible to host a Climathon 24-hour hackathon.

Discover which cities have pledged to tackle their climate challenges through the power of citizen engagement and innovation.

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Help find solutions to some of the world’s toughest climate challenges


Until now, the transport industry has been the most resistant to emissions progress. At the same time, cities are key in tackling this challenge as they are faced with the mobility trilemma of clean air, carbon, and congestion whilst facing ever increasing demands to move people and goods around.


Buildings play a crucial role in mitigating climate change and are directly linked to the resilience of future neighbourhoods, districts, and cities. There is an urgent need for cities to bring about a significant increase in current retrofit rates to realise the "well below two degrees" Paris goal.

Circular economy

Traditional linear economy supports short-sighted design, conspicuous consumption, and inefficient waste handling. Cities are prime candidates for pioneering a new, long-term vision: The circular economy—which integrates sustainable production across supply chains as well as better consumption.

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