Yale Environment 360: In Puget Sound, one of America's great estuaries, killer whales, seals, and schools of salmon swim not far from more than 3 million people who live in the Seattle region. The presence of such impressive marine life, however, belies the fact that the sound is seriously polluted. When it rains, storm water washes into the same system of underground pipes that carries the region's sewage, and 1 billion gallons a year overflow into the sound when area sewer systems contain more water than can be treated....
URL: http://www.guardian.co.uk/environment/2012/aug/23/how-cities-nature-cut-pollution
Enclosure: http://static.guim.co.uk/sys-images/Environment/Pix/columnists/2011/5/19/1305802266713/Green-roof-of-New-York--P-007.jpg
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