Hi P,
There are swings in the world's temperature it seems that can be quite large and rapid, several degrees over a thousand years or so. These swings are due to the combined effects of all the natural forcings following the naturally oscillation in the sun's intensity that is known to change on several different time scales, 11 years, 22 years, to thousands of years and so on.
These oscillations in the world's temperature cause feedback mechanisms to be activated that accelerate the rate of warming or cooling and amplify the effect of the sun.
Is it the case do you think that the larger and more rapid the oscillation one way the more rapid the swing back, very hot to very cold quickly, over thousand years or so?
If that is the case even though CO2 is currently amplifying hot trends a sudden cooling of the sea could cause a large increase in CO2 absorption dropping that forcing, closing the NAD, sudden Ice sheet formation or at least sudden increases in snow area, leading to increase albedo, and a rapid cooling, which could tie in with a drop in sun's intensity that is about to happen after 2012.
This scenario may not happen although either way putting more CO2 into the atmosphere if the NAD remains intact will cause a massive heating or it will accelerate the Greenland Ice Sheet melt to such an extent that we get a missive cooling, either way though CO2 will be making it worse?
A paradox cold swing due to intensive warming maybe??
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