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Originally Posted by cwes99_03
It doesn't matter where it comes from the fact is that greenhouse effect refers to atmospheric CO2. It claims that the CO2 in the atmosphere is significan't higher (according to ice core samples) than it has been in the past 400 years (not 400,000 as posted above) because they believe they can go that far back in their core sampling (of course there is no garauntee that they can positively identify a sample from say 1776 because that sample may have melted completely away to expose the previous years sample).
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Actually it is more like 200,000 years they have ice core data for from Greenland. I hear figures as high as 600,000, but here's from the horses mouth as it were:
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Originally Posted by NOAA
Studies of isotopes and various atmospheric constituents in the core have revealed a detailed record of climatic variations reaching more than 100,000 years back in time.
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http://www.ncdc.noaa.gov/paleo/iceco...mmit/document/
