Change Agent Cities turn to innovative 'green infrastructure'

From Seattle to Sweden, city and regional governments are using roof gardens, specially designed wetlands, and other forms of 'green infrastructure' to rein in pollution – and to save money.

By , Yale Environment 360

Colin Braley/Reuters/File

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.