here are my though's ont he subject. personally i think it is a scare. ill used some of the stats they used to prove my point. they said that in the last 100 years the temperature has risen 0.6 degrees celsius. they also said that for the greenland ice sheet to melt the temperature of the earth must rise and additional 3.0 degrees celsius. now if the temperature keep rising at the same rates as it is now, it will take 500 years for that temperature to be reached. I also read a stat a long time ago when i was researching this topic for school that stated that 75% of the earths rise in temperature is not due to mankind, it came from animals such as cows, and from the earths own geometric activety and also possiblely from the earths own trend that it is warming up since the alst ice age.
now in may opinion looking back at the last 100 years and looking at what we are doing now i think that this 0.6 incement is going to get smaller. all you have to do it look at what we are doing today. cars are being made that produce much smaller amounts of pollution. we are moving to other mroe efficent power sources instead of burning oil and coal. (e.g. wind, hydro, and nuclear). all new technologies that come out now are producing less pollution that the technology that came before them.

on another note, i think that mankind should worry about ozone depletion and the diseases that are cause by pollution, then global warming.