Guest essay by Andy May The Holocene Thermal Optimum ended at different times in different parts of the world, but it had ended everywhere by 4,000 BP (BP here means the number of years before 2000) and the world began to cool. The timeline shown in Figure 1 shows the GISP2 Central Greenland ice core […]
via Climate and Human Civilization for the Past 4,000 Years — Watts Up With That?
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