Instead of fearing floods, a man has come up with an idea to embrace them by creating sponge towns to absorb rainfall. Inspired by a near-death experience where he was dragged into a river, Yu Kongjian decided to use the environment to absorb water, like a sponge. It has been rolled out in cities across China, and Yu thinks other places could use it too, in light of more extreme flooding linked to climate change. Can sponge cities help combat extreme weather? Look.