http://www.digg.com has some great posts about living green. In particular is an article written with ideas for "city-dwellers" on how to have a green roof. here is a selection from that article:
"Intensive green roofs often have a soil depth of a foot or more, and require substantial structural elements to support the weight of the whole roof. Intensive roofs can sustain a wide range of plant species and typically require a fair amount of regular maintenance"
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