The amount of water used globally (approx 10^13 m^3) is only about 2.5% the total yearly evaporation off of the ocean (approx 4*10^14 m^3). I suspect small cha

The amount of water used globally (approx 10^13 m^3) is only about 2.5% the total yearly evaporation off of the ocean (approx 4*10^14 m^3). I suspect small changes in climate have a much greater effect on net evaporation.