I did a Google search. The Vostok data show global warming began about 18,000 years ago, and global cooling has been occurring for several thousand years. Also, the CO2 and temperature were near current levels abour 130,000 and 240,000 years ago.
Graphs showing this are at the link below which has this quote ---
Quote ---"Based on the analysis of entrapped air from ice cores extracted from permanent glaciers from various regions around the globe, it has been demonstrated that global warming began 18,000 years ago, accompanied by a steady rise in atmospheric carbon dioxide. What caused this phenomena is a matter of ongoing debate. Clearly, though, global warming and rising CO2 levels in Earth's atmosphere started long before the industrial revolution."
link to graphs of Vostok CO2 and Temperature
At the link for Vostok graphs, links are available for the Vostok data going back about 240,000 years. The CO2 and Temperature appear to cycle and reach a peak around every 100,000 years.
"The CO2 and Temperature appear to cycle and reach a peak around every 100,000 years."
yes, in cycles -- showing the Earth DOES have large-scale climatic cycles quite possibly -- of even longer time scale then the decadal ocean basin cycles
but the last 100 years is anamolous -- showing a 100 percent increase in CO2 over the peaks in the previous half-million year's data
the fact that atmosphere CO2 lags ice core CO2 is just another reason we don't have to sign Kyoto: there may well be lots of lead time on this one