If you were to take an area about 1200x1200 sq ft[[33 acres) and fill it with tailpipes from cars, you could put about 28 million 3in dia. tailpipes in that area, including the space between each tailpipe. If each tailpipe represented one car and each car ran 1 hour a day[[I don't know if this is average) this would be the equivilent of close to 700 million cars, which is about how many there are in the world. So on 33 acres you have all the car emissions in the world being produced.

This is just off the top of my head, anyone care to figure out how many fossil fuel burning power plants there are and how much space there smokestacks take up. This is just to put things into prespective comparied to the size of the world and the influence of the oceans, valcanos, weather, cycles, sun, etc. How much difference is man making compaired to all the rest in regards to globel warming. I know people on both sides can present all kinds of facts, but I was just wondering how much man really does.