[ProtectOurFreedom]

So human migrations were set in motion by a 23,000 year cycle of solar radiation. It's fascinating that this period is about one-sixth of the time it took humans to migrate out of Africa. If the solar cycle could influence global atmospheric humidity and glaciation that much, the why all the ado about human-forced climate change today? Man obviously adapted before when he had about zero ability to do so other than walking a few tens of miles to a new location to hunt and gather food.

Previously, the timing of episodes of increased humidity was largely linked to global interglacials, with the climate of Arabia during the intervening glacial periods believed to be too arid to support human populations. [Now] Parton and colleagues suggest, however, that periods of increased rainfall were not driven by mid-high latitude deglaciations every ~100,000 years, but by periods of maximum incoming solar radiation every ~23,000 years.

[SunkenCiv]

/bingo

[SunkenCiv]

And we haven’t been able to make that river in Arabia flow again, or stop flowing in the first place.