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Idea to send:	Topic Land Use Content This idea is partly about energy, but mainly about making sure space is used instead of going to waste. Rooftop area, that is.Any building with ground-floor area greater than about 22,000 square feet, or campuses of buildings with total ground floor area greater than 22,000 square feet, should be required to have 80 percent of the roof area covered in either solar panels for producing energy (with a minimum efficiency requirement), or green living things such as grass or trees.