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Dinesh

Dinesh club

Posted: 03 Dec 2019

Taken: 03 Dec 2019

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Excerpt •
Not by Genes Alone •
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Peter J. Richerson •
& •
Robert Boyd •

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Photo replaced on 03 Dec 2019
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Figure 4.3 ~ Thousands of Years Ago

Figure 4.3 ~ Thousands of Years Ago
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 Dinesh
Dinesh club
Fluctuations that occur over tens of thousand of years are not likely to have driven the evolution of adaptations for social learning. Populations will adjust to such slow changed by changing their ranges and by organic evolution. However, the increased variation over such long timescales seems to be strongly associated with variation at much shorter timescales. High-resolution data for the last 80,000 years old, improving to monthly resolution for events after 3,000 years ago. During the last glacial, the ice core data show that the climate was highly variable on timescales of centuries to millennia. Figure 4.3 illustrates how dramatic this variability was. Even when the climate was in the grip of the ice, it briefly spiked to near integlacial warmth every thousand years or so. The intense variability of the last glacial carries right down to the limits of the decade-level resolution of the ice core data. Sharp spikes lasting high resolution data from temperate and tropical latitudes verify that the high-amplitude fluctuations seen in the ice core are global phenomena, and some of the best records suggest that most or even all of the world’s climates fluctuated to the same beat recorded so beautifully in Greenland ice. ~ Page 133
4 years ago.

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