Green Roof on Canada's MEC building. Photo via Flickr: by PardraicGreen roofs have expanded by 35 percent over the last couple years, with more than 3.1 million square feet installed last year. Chicago leads the way in the U.S. with 534,507 square feet worth. That doesn’t seem like a lot considering green roofs are about to be law in Toronto, but it all starts adding up. Washington, D.C. comes in a close second with just over half-m...
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