Ice core methodology overview:
Ice Cores That Tell The Past
I found this article at BBC's site noteworthy:
BBC NEWS | Science/Nature | Deep ice tells long climate story Quote:
The "scary thing", he added, was the rate of change now occurring in CO2 concentrations. In the core, the fastest increase seen was of the order of 30 parts per million (ppm) by volume over a period of roughly 1,000 years.
"The last 30 ppm of increase has occurred in just 17 years. We really are in the situation where we don't have an analogue in our records," he said.
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