Well, you can't because global warming isn't real. Did you know that the earth is cooler (by a small amount) actually than it was in like the 16 centuries? When people claim global warming the only study one part of the earth. Not the earth as a whole. Something I have heard about but never tried is filling a cup with water and ice to the brim of the cup. Wait until the ice melts. The cup should NOT overflow. I'm doing this tomorrow to see the result and will let you know.