[escolubtessen]

There have been many models of the years. I merely said I believed positive feedback was a big part of the currently accepted ones, you said it had been discredited. well presently the atmosphere is not acting the way there models say it should.

Prior to about a million YBP, ice age cycles occurred on a 40,000 year cycle. When the cycle changed to 100,000 year cycles, the extremes between glacial - interglacial became much greater.

Its still unknown why the length of cycle changed, but scientists know that the orbital (Milankovitch) cycles of the Earth did not change (not the cause).

Their models cannot account for it. & the model hind casts that say small forcing (orbital cycles) strong positive feedback (glacials) are programmed to come up with that conclusion based on the hypothesis.
Clouds can account for glacial cycles http://www.ras.org.uk/news-and-press...arth-to-thrive
Just as they can account for the faint sun paradox