Montrovant
Fuzzy bears!
I'm not sure how the Earth being warmer 3 million years ago disproves that mankind may be causing warming now. Does manmade global warming mean only warming that is greater than it has been at any point in the past?
Regardless of whether humanity is contributing to the warming of the planet, the fact that it was warmer 3 million years ago neither proves nor disproves the idea.
If CO2 was as high 3 million years ago, how did it get that high? Maybe man isn't causing the rise of CO2 now but some natural phenomena is.
Mark
That might be. My point was that the level of CO2 3 million years ago doesn't prove whether or not man is contributing to it now.
but it does prove no big deal.
How does it do that? Maybe it's no big deal for the planet, but it could be a big deal for humanity.