In heavily-paved urban areas, a good downpour can quickly overwhelm a municipal sewer system. But an ancient building technique that’s popular in Europe suggests a way to alleviate the problem: add a touch of green to the roof. Roof-top vegetation provides insulation, cooling and waterproofing; and it can help prevent runoff, too. Several German cities already require so-called “green roofs” on all new commercial buildings. Here in the U.S., the idea is just catching on. And we found one of its proponents. Tom Liptan is a storm water specialist for Portland, Oregon — a city where sewer overflows are common. Two years ago Mr. Liptan built a green roof on top of his garage.
The story you just read is available to read for free because thousands of listeners and readers like you generously support our nonprofit newsroom. Every day, the reporters and producers at The World are hard at work bringing you human-centered news from across the globe. But we can’t do it without you: We need your support to ensure we can continue this work for another year.
When you make a gift of $10 or more a month, we’ll invite you to a virtual behind-the-scenes tour of our newsroom to thank you for being with The World.