Hydro-electric power...China produces about 4 times more than the U.S... Can China continue to produce products cheaper than the U.S. with the current output of hydro-electric power available?... https://en.wikipedia.org/wiki/List_of_countries_by_electricity_production_from_renewable_sources http://chartsbin.com/view/42124 Do bigger producers of hydro-electric power per person in each country have more water flowing than the U.S.?... If the world runs out of oil in 40 or 50 years and coal supplies deplete 20 or 30 years after the oil due to a soar in usage, will the water still be flowing thru hydro-electric plants if maintained and securely protected well?... Drink up on learning about abundant, renewable energy...LJ