Sublime

Among numerous other urban revitalization programs, tree planting thus became a major policy goal for US cities. In 2006, Los Angeles, a city with 1.5 million trees, set a goal of planting a million more. They also sought to replace the iconic non-native environmentally underperforming palm tree with native shade trees.11 In cities like Pittsburgh,

the mills closed in the 1980s, a nascent green movement in Pittsburgh mobilized around reviving the rivers for recreation as well as for environmental health. Eventually the rust belt’s rivers began to grow cleaner. Yet there were ongoing problems. Acid mine drainage polluted fifteen thousand miles of rivers and streams.