The Philadelphia Inquirer covered the growth of green roofs in Philadelphia in an article published April 22nd:

Across the city, the tops of buildings and parking lots are sprouting greenery like never before. The number of green roofs in Philadelphia has tripled since 2010, according to the Water Department, which tracks the roofs because they absorb storm-water runoff. The city now has 111 green roofs, roughly 25 acres’ worth. An additional 64 roofs are in the queue.

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