Green roofs sprout in USA and Canada

Green roofs are becoming increasingly popular in US cities with major initiatives in Chicago, Portland and Washington.According to Green Roofs for Healthy Cities roughly 10 million square feet of green roofs were built in 2009, compared to a million in 2004.

Toronto, Canada has become the first city in the Western Hemisphere to mandate green roofs. New buildings with a total floor area of more than 21,527 square feet will, depending on their size, have to cover from 20 to 60 percent of their roofs with vegetation. A 2005 study calculated that if 75 percent of the flat roofs in the city were greened,Toronto  could reap $37 million a year in savings on strom water management, energy bills and costs related to urban heat island effects.

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- who has written 871 posts on My Climate Change Garden.

I am not an experienced gardener - more of an enthusiastic amateur who learns by trial and error and is keen to "manage" the effects of the weather on my garden. Writing this blog is my passion and I hope that it will continue to grow, allowing global gardeners to communicate about the effects of climate change on our plants and the future of our gardens.

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