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A green roof is the roof of a building that is covered with vegetation and soil or another growing medium. Other layers such as a waterproofing membrane, a root barrier, or drainage and irrigation systems are often included as well. Sometimes referred to as rooftop gardens, ecoroofs, or vegetated roofs, green roofs are becoming increasingly popular for their environmental, economic, and aesthetic benefits.

The green roof of Chicago's city hall was planted in 2000 to test the effects of such roofs on air quality and temperature. It contains over 100 species of shrubs and vines, mostly prairie plants native to the Chicago region
Source: TonyTheTiger/Wikipedia

The benefits attributed to green roofs are numerous. The first is energy efficiency. By providing a layer of insulation and absorbing the heat ...

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