Like anything else, water is great in moderation—urbanites need it to survive, but downpours can flood streets and homes. And as you might have noticed, climate change isn’t good at moderation. A warmer atmosphere holds more moisture, supercharging storms to dump more water quicker, which can overwhelm municipal sewer systems built for the climate of long ago. Thus you get the biblical flooding that’s been drowning cities around the world, from Zhengzhou, China, to Seoul, South Korea, to Cologne, Germany, to New York City.
In response, urban planners are increasingly thinking of cities less as rain jackets—designed to whisk water away as
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