Lauterbrunnen, Switzerland green roof
photo by Ken Reed
“Hardy sedums, insects, and birds rule the roof at a hospital in Basel, Switzerland, where foliage is mandatory on new flat roofs. ‘If we steal the ground for a building,’ says International Green Roof Association director Wolfgang Ansel, ‘we can give it back to nature on the roof.’”
Photograph by Diane Cook and Len Jenshel, National Geographic
