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Politics : Politics for Pros- moderated

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To: greenspirit who wrote (100580)	2/15/2005 1:58:16 PM
From: KLP	Read Replies (1) of 793698

March 2005 issue of Scientific American has article: "How did humans first alter Global Climate?"... by William F. Ruddiman A bold hypothesis suggests that our ancestors' farming practices started warming the earth thousands of years before we started burning coal and driving cars. ..."New evidence suggests that concentrations of CO2 started rising about 8,000 years ago, even though natural trends indicate they should have been dropping. Some 3,000 years later the same thing happened to methane, another heat-trapping gas. The consequences of these surprising rises have been profound. Without them, current temperatures in northern parts of North America and Europe would be cooling by three to four degrees Celsius --enough to make agriculture difficult. In addition, an incipient ice age -- marked by the appearance of small ice caps -- would probably have begun several thousand years ago in parts of northeastern Canada. Instead the earth's climate has remained relatively warm and stable in recent millennia." ... Big article, magazine just out, haven't started to read it yet....and it's not yet on their website... Have humans possibly averted the start of a new ice age???? Even the scientists don't know, and can't agree.

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