Global Warming and our Changing World

Global Warming is caused by an excess of greenhouse gases in the atmosphere, right? Gases like Carbon Dioxide... Which we humans breathe out, and trees and plants breathe in. Then the plants produce oxygen, which we breathe in, etc., etc., etc.

And a few years ago, lots of people were up in arms complaining about the destruction of rainforests.

So if we've got too much C02, why not just plant a huge group of trees? Tons of trees. Tons and tons and tons of trees! Then they'd automatically be able to suck in all that C02, right? And we could go right on polluting until oil runs out...