At this moment Global Warming has over whelmed human kind. Global Warming has caused a lot of damage to earth. Global warming was started by humans using Cars, Factories, making wild fire and more object, are causing Smoke and green house gas to go into the atmosphere and making it thicker. When the atmosphere gets thicker. Then the heat doesn't go out, but stay in to make it hotter.

       The polar Bears' species is one of the effected species because of global warming. If you leave ice out to long in heat it melts into water. Same thing for Green Land and North Pole and other icy places.

           If you put ice in a cup, it melts. The cup water will then increase. So what happens when North pole or Greenland melts. Water already cover lots of earth. If that melts some places on the coast will be under water. People have been finding died polar bear. If this keep going on the polar population will disappear. Your son's or daughter's may not see a polar bear.