Global Warming and our Changing World

I've heard that a way to combat global warming is to plant a tree. Sounds good. Trees breathe in CO2, and give off O2. So the more trees we have, the less greenhouse gas, and the less the world will heat up.

If everyone on earth planted a tree tomorrow, we'd have roughly 6 billion new trees growing, providing shade, and purifying the air. It sounds like a very good deal.

I think if the world got together for Tree Day and pretty much mandated that one tree be planted for every individual, we'd all be the better for it.