Posted by Janicholson on February 03, 2011 at 21:40:38 from (67.72.98.45):
In Reply to: Re: Global Warming posted by S2710 on February 03, 2011 at 19:30:40:
Between the extremes of the Earths formation 4.6Bybce as the Earth was smashed into by the proto moon then settled down to our current system, and several cycles of hot house and freezing periods, several trends stick out. The first is that our sun is a long period variable star. The second is that that period seems to have an approximate 150,000 year period for major variation which also tracks the geometry of the orbital variations and pole drift. there is also a more recent trend for a more subtle oscillation of about 15,000 yrs between lesser glacier intrusions. The last was ~ 13,000 yrs ago. The pattern would be expected to trend toward that lowering temperature and the first blush of an ice age (very slow, and 2 to 3K years of cooling to get there). The cooling trend has been noted from data gathered from ice cores, and other sources not dependent on human instruments, but that trend is bent in a hockey stick transition to warmer. The content reflected here is from reading (quantities of it) in science Journals, geology texts and Scientific American. Those who believe would rather not, but my head is too blunt to allow me to stick it in the sand very deep. Jim
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