Originally Posted by: LordathestringsIf you look >here< you'll see that the current CO2 level is nearly twice as high as it's ever been!

To be absolutely fair, you can't say it's higher than it's ever been as that chart only shows a 1000 and 4000 year history, and they speculate that some of Earth's earlier stages of atmosphere had a makeup of purely carbon dioxide, carbon monoxide, water, nitrogen, and hygrogen. It was the blue-green algae ("primeval slime" if you will) that split the molecules of H20 and C02 into O2. It drastically (for the slime's sake) reduced the richness of CO2, replacing it with oxygen (which when making it to the upper atmosphere reacted to the sun's radiation and created O3-ozone). Yet the hard elements that help determine the levels have not been found in rocks older than about 3 billion years ago.

But your point still stands. I'm just playing advocate.