What other energy sources other than Fossil Fules that can be nonpollutable?

Question by mrdrowns: What other energy sources other than Fossil Fules that can be nonpollutable?
Other than “Hydorelectri Energy” “Air Energy” and “UnderWater Energy”

Best answer:

Answer by geewhiz
HORSEPOWER WITHOUT FUEL==HORSE AND BUGGY

Give your answer to this question below!