Data from Ice core sampling show that atmospheric CO2 levels and global temperatures have moved through cycles for at least the past 425,000 years. In these cycles, the atmospheric CO2 typically goes from a low of about 180 ppm to a high of about 280 ppm and temeratures go from levels of about 12 degrees C colder than current to a high of about 3 degrees greater than current. See the data here: http://www.ncdc.noaa.gov/paleo/icecore/antarctica/vostok/vostok_data.html
Since these changes cannot have been due to green house gas emissions from human use of fossil fuels, what it the cause of these cycles.
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2007-01-19
11:54:36
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6 answers
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asked by
Anonymous