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The PBS program I referred to was talking about a drought and drop in sea-level that resulted from an Ice Age, when glaciers bound up a great deal of the water in the atmosphere and the oceans, forcing those in interior Africa like the clicking bushmen we are descended from to move.

There have been lots of ice ages in history, but not many super volcano eruptions. When a dramatic drought falls reasonably close to the latter and PBS blames the former I get suspicious. There is loads of liberal angst regarding the former, but little regarding the latter. I guess they haven't figured out how to blame volcanoes on Bush yet. They'd love to have an ice age just to blame Bush for it. Absolute geologic dates c. 75k ago often are give or take a few thousand years. Sometimes data exists to compare one ancient event to another more precisely. I don't know if that exists here. If the drought closely followed Toba I'd blame Toba even if there was an ice age then. It wouldn't surprise me for Toba to have triggered an ice age itself. It put a lot more into the atmosphere than we and the Russians could have in nuclear war, yet the left loved scream about 'nuclear winter.'