thanks.
I was just listening to a lecture on neolithic England, about 3000 bc when the temperature was 3 degrees C higher than it is now.
One of his comments was that we are now in an “interglacial” period, and are overdue for it’s return, since the average “interglacial” period is 10 thousand years, and our present one has gone 12000 years so far. And since carbon emissions have only been present for half a century, they can’t blame it on industrialization.
The big unanswered question is what has caused the previous ice ages to begin at 100,000 year intervals. SC has a good book on what may have caused the Younger Dryas, a boloid event. I think that the dip around 22 or 23 thousand years ago was caused by the Sakura-Jima eruption that left a 15 mile diameter caldera. Ice ages starting in the 600 kya and 700 kya periods might have been caused by the Yellowstone Caldera and the Long Lake caldera. Anyone have other candidates? And if major events caused those other ice ages, what might precipitate the next one which is almost overdue.