The Greening of America

摘要

Spurred by visions of their cities frying in a warmer world, mayors around the nation have grasped a green solution: trees! Like Johnny Appleseed, they have vowed to sow their seeds in great profusion, promising millions of new trees in the coming years. Arbor Day, that old fusty holiday, is getting a makeover. Cities once planted trees because they were beautiful. Now trees are being retasked as "green infrastructure" managed by "urban foresters" to work as powerful energy-saving, carbon-sucking, wastewater-treating tools to save the planet. But as the mayors spin their green dreams, their releaf teams have had to confront a brutal reality: Planting a tree is a lot harder than it looks.