Actually, putting dirt up there is only half of it. The other half is actually growing stuff up there. At my university we use these so called 'green roofs', i've included a pic, here's the article from our website
Quote:
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A portion of each academic building rooftop is "green". This flat-roof technology uses soil beds filled with low-maintenance plants that are native to Ontario. Green roofs are able to offset some of the negative effects caused by urban development as concrete structures prevent rainwater from being absorbed into the soil and cleaned naturally. Instead, some rainwater is captured and held before it can reach the ground, meaning this moisture is eventually returned to the atmosphere. Any surplus runs off into an underground, 250,000-litre storage area and is used for irrigation, thereby reducing municipal water use
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http://www.uoit.ca/EN/main/11260/151..._speaking.html
As I understand it, ford has done something similar at their dearborn truck plant