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Strategies & Market Trends : The Epic American Credit and Bond Bubble Laboratory -- Ignore unavailable to you. Want to Upgrade?

To: yard_man who wrote (66388)	7/19/2006 10:15:04 AM
From: Elroy Jetson	Respond to of 110194

Ice cores, both from the Antarctic and Greenland, extend back far further than other "recording devices" such as tree rings. The information from ice cores is consistent with the data from other sources, as far back as they go. The errors which can occur when taking ice cores such as "ice relaxation" and "sample contamination", as highlighted in the Wikipedia article you found, are identified when they are compared to the results of ice cores taken from other locations. As with any scientific measurement, the error rate is reduced with each additional sample. As additional ice cores are analyzed, the data becomes more certain. According to NASA, the most recently found Antarctic ice core extends back for 740,000 years, which will extend the current data another 300,000 years. earthobservatory.nasa.gov .