Quote:
Originally Posted by oil pan 4
If all climate change is man made then how did the last ice age end?
And the one before that?
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* The last four ice ages ( G'u'nz, Mindel, Riss, and W'u'rm ) all saw abrupt warming associated with an increase of 80-100 ppmv carbon dioxide.
* The last deglaciation ( 14,700- 13,000 years ago ) was interrupted by the 'Antarctic Cold Reversal'.
* At 12,900 years ago there was an abrupt, massive global cooling, over 1,300-years in the Northern Hemisphere.
* At 12,000-years ago, carbon dioxide was 180 ppmv.
* At 10,000-years ago, the sea level rise reopens the Bering strait Arctic ocean circulation.
* Half of a Milankovich Obliquity cycle was in play with solar insolation.
* At 8,500 B.C.E. we hit the Younger Dryas, Methane Minimum.
* At 8,000 B.C.E. the Nares Strait ocean circulation opened.