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As climate change leads to global temperature rises, cities around the world are being faced with extreme levels of heat. This can bring whole cities to a halt, disrupt key infrastructure, and for the most vulnerable in society heat can be a killer.

But where there’s a problem, innovation is never far behind.

We meet the people who are trying to find solutions – from urban design to keep cities cool, to social projects offering refuge of cool, to the apps making sure the most vulnerable people get the help they need to survive.