He's walking through a 1964 lecture that acknowledged something most people still don't realize: the last ice age didn't end gradually. New dating methods, particularly radiocarbon analysis of ocean sediments and terrestrial deposits, were revealing a far more dynamic picture than the slow, orderly retreat textbooks had taught for decades. The scientific community was beginning to see that ice sheet collapse, ocean circulation shifts, and atmospheric changes were all tightly coupled, not independent processes unfolding over smooth timelines.
What strikes him here is how early this insight appeared in the literature, yet how long it took to penetrate mainstream thinking. The evidence was pointing toward abrupt transitions, feedback loops between ice, water, and air, and a climate system capable of reorganizing itself rapidly. That's not speculation. That's what the physical data from cores and stratified deposits were starting to show, and it fundamentally challenges the gradualist assumptions that still dominate public understanding of climate history.
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