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Politics : Politics of Energy

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To: Wharf Rat who wrote (36334)	12/8/2012 2:33:38 PM
From: Brumar89	2 Recommendations Read Replies (1) of 86356

The third stage or the Holocene climatic optimum (from 10 to 4.5-3 thousand years ago) was the warmest and driest. Global climatic warming and thawing of permafrost in the contemporary mid-latitudes characterized the Holocene optimum in Eurasia (Baulin and Danilova, 1988). Air temperature increased up to 4.4-5.2°C in the high latitudes (Velichko, 1975; Velichko and Nechaev, 1992). .... There were two stages of permafrost degradation in Western Siberia (Astakhov, 1995). The first stage began when surface water bodies warmed enough to perforate permafrost by numerous sinking thermokarst ponds and to produce local taliks. The second stage, which only took place to the south of the Arctic Circle, began when climate became so warm that direct solar heating of the deposits was capable of producing regional taliks or a perennially thawed layer separating the Pleistocene permafrost from the seasonally frozen layer. .... Well, that cinches it ... what you're warning against has happened before and no dreaded tipping point resulted.

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