based on toronto-becomes-first-city-to-mandate-green-roofs/
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Green roofs can help regulate city temperatures, giving people, and the electrical grid, a much needed break.
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On April 30th, Toronto will become the first city in North America with a bylaw that requires roofs to be green
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will require all residential, commercial and institutional buildings over 2,000 square meters to have between 20 and 60 percent living roof
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in the footsteps of other cities, like Chicago and New York.
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Chicago boasts 7 million square feet of green roof space
