[ZX12R]

And now ~80 ppm higher than anything nature achieved over the past 650,000 years. That's why science is examining the issue.

Your fact picking is obvious. The overwhelming majority of earth history has co2 levels WAY above today's levels. Then of course, there's the so what? factor. The co2 level doubles in my office, when someone comes in to talk to me. Then amazingly, when they leave, it drops again.

[cogitator]

The overwhelming majority of earth history has co2 levels WAY above today's levels. Then of course, there's the so what? factor.

The overwhelming majority of Earth's geological history didn't have a climate system like now. Ever hear of plate tectonics? Quick quiz: what happened to global climate when the Panamanian isthmus closed? Answer in 200 words or less. This link should get you started:

Panama: Isthmus that Changed the World

Other questions on upcoming quizzes will concern the impact of Himalayan uplift on global temperatures and the puzzle of glaciation during the Ordovician. Keep asking questions: it's healthy.