Speaking of Homes
Here in the South so much heat energy is wasted. It could be used to heat water or generate electricity.
There is attic heat that could be used. There is also the waste from the home AC units that is being put back into the air.
There has to be a better way to keep homes cool. Black asphalt roofs don’t make a lot a sense. Why not build a light colored shade over the existing roof. This shade would be set several inches above the roof and be open along the edges of the house, and at the peaks.