![Picture of a bus shelter growing plants on its roof](https://i.natgeofe.com/n/278f80a7-d426-4e99-b917-acdaeab01538/NationalGeographic_1212046.jpg)
Tiny Green Roof
This photo of a San Francisco bus shelter appeared in a May 2009 story about green roofs. When utilized on a large scale, green roofs can mitigate storm water runoff, lessen the urban heat island effect, and, of course, provide a pretty change of scenery in the city.
Photograph by Diane Cook and Len Jenshel, Nat Geo Image Collection
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