Clean energy is all around us in various untapped forms. It’s just a matter of finding out how to tap those untapped sources of green energy. Take this development: lakes and reservoirs in the United States could generate 325 gigawatts of power, which would account for 70% of the country’s output. Nor would that vast untapped source come in the form of yet more dams, which could cause massive environmental harm. Rather, it would come through harnessing water evaporation.