Ice Core Records for the Last 800,000 Years

http://www.guardian.co.uk/environment/2010/may/04/climatologist-mosley-thompson-warming-antarctica

There have been some extremely deep ice cores taken in Antarctica at Dome C that go back 800,000 or 900,000 years.  I understand that the Dome C record shows very clearly that we've got more CO2 in our atmosphere now than at any time in 800,000 years.

Mosley-Thompson: Oh yeah. Very clearly. If you look back over the eight glacial/interglacial cycles, you essentially see that CO2 never rises above 300 parts per million and we're at about 389 now. Methane never rises above about 800 parts per billion, and I think we're at about 1,700 parts per billion. So we're clearly outside the range of natural variability. I personally think that graph simply showing the natural fluctuations in those two important greenhouse gases, over almost a million years of Earth history — and then you see the two dots [today] that are so much higher than anything that we see in that near-million history — tells us very clearly that we have a serious problem.

Read the entire article at the link above.  And then sit dowm and weep - not necessarily in Grand Central Station.  Once you've expressed your anger and sorrow, write the Honorable Stephen Harper and demand that he revise Canada's climate change  policies .   Check out Transition Towns and work on an energy descent plan for your local community.  Push your pension plan to de-invest in companies that commit ecocide - like BP.  Revamp your RRSP holdings - click on the Corporate, Environmental and Social Responsibility link on my blogroll to vet a company.  Educate other people.  Make social connections.  Eat local food.  Devote your time, money , and energy to any cause that makes the world better - like http://www.350.org/.