Green roofs are simply roofs that have greenery on them. But that greenery is there to do more than just look nice for those brave enough for the heights. First and foremost, green roofs help reduce runoff, keeping the city's water supply clean, and at The George Washington University, they're taking it a step further and recycling the rain water they collect for use in non-drinkable water sources. So, not only to green roofs keep the water supply in urban areas clean, but they can also help use less water and energy.
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