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Politics : Formerly About Advanced Micro Devices

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To: tejek who wrote (272227)	2/5/2006 4:09:05 PM
From: d[-_-]b	Read Replies (2) of 1575627

tejek, re:Hmmm....isn't it odd that the earth starts to heat up just as the industrial revolution gets underway and that CO2 levels in the atmosphere now far exceed the norm established for thousands....wait, I think its millions of years. Making shit up again - over last millions of years the level of CO2 has averaged 1500 ppm and as high as 7000 - but now it's around 350 which is rather low. geocraft.com Average global temperatures in the Early Carboniferous Period were hot- approximately 22° C (72° F). However, cooling during the Middle Carboniferous reduced average global temperatures to about 12° C (54° F). As shown on the chart below, this is comparable to the average global temperature on Earth today! Similarly, atmospheric concentrations of carbon dioxide (CO2) in the Early Carboniferous Period were approximately 1500 ppm (parts per million), but by the Middle Carboniferous had declined to about 350 ppm -- comparable to average CO2 concentrations today! Earth's atmosphere today contains about 370 ppm CO2 (0.037%). Compared to former geologic times, our present atmosphere, like the Late Carboniferous atmosphere, is CO2- impoverished! In the last 600 million years of Earth's history only the Carboniferous Period and our present age, the Quaternary Period, have witnessed CO2 levels less than 400 ppm.

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