The science behind global warming doesn't support the doomsday scenarios put forth by Al Gore, the media, or even the IPCC. The claims they have made are unsupported by science, and they refuse to admit the weakness of their arguments. Why? Because they have an agenda they would like to see go forward regardless of whether global warming is a serious problem or not.
The key to understanding temperature trends on earth is the sun, and more particularly the solar wind. Solar wind mediates the global flux of Cosmic Rays. Cosmic rays mediate cloud formation, and clouds mediate incident solar radiation reaching the earth. Go to wikipedia and look up sun spots. Take a look at the nice graph showing solar activity as reflected in sun spot data over the last few hundred years. Note the period of low activity.
Now go to the page on the Little Ice Age. Look at the graph showing temperature trends. Note the that period of the little ice age is identical to the period of low solar activity from the previous page. _THIS IS NOT COINCIDENTAL_ There is a proven link.
If you want to learn about the relationship between solar activity, cosmic rays, cloud formation, and global temperature, visit http://www.sciencebits.com/ice-ages
The sun is now ending its most active period since records started, which means we are in for some cooling for the next couple of decades. I guess we will see who is right, who is really interested in science, who is really interested in politics, and who the sheep really are.