In certain areas of the country green roofs are very popular, in others it's tree planting and in still others it's rain gardens. Each of these options work well to reduce or eliminate polluted urban run-off. "Green Roofs: Are They Worth the Expense"
The only problem with choosing only one practice over another is ... "WE ALL KNOW THERE IS NOT JUST ONE ANSWER TO OUR PROBLEMS"!!!! Chicago's Mayor is obsessed with green roofs because it somehow works in with transportation climate change offsets. But by putting all marbles into one solution a lot of opportunities are missed.
Generally speaking, rain gardens are cheaper, easier and faster to install and have more benefits than green roofs.
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