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Tipping Points for Runaway Climate Change

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What force, more than anything else, has regulated the evolution and expansion of mankind throughout history? A new study with climate models by geneticist Andrea Manica at the University of Cambridge, UK, and his colleagues shows how sensitive the human species has been to climate over the past 120,000 years and continues to be to the present day. The rise and fall of ice sheets and sea levels and the desertification of continents acted as road blocks to control the migration and settlement of humans across the planet.

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