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Olduvai III: Catacylsm
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Polar Warning: Even Antarctica’s Coldest Region Is Starting to Melt

Polar Warning: Even Antarctica’s Coldest Region Is Starting to Melt East Antarctica is the coldest spot on earth, long thought to be untouched by warming. But now the glaciers and ice shelves in this frigid region are showing signs of melting, a development that portends dramatic rises in sea levels this century and beyond.  No […]

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How the World Passed a Carbon Threshold and Why It Matters

How the World Passed a Carbon Threshold and Why It Matters Last year marked the first time in several million years that atmospheric concentrations of CO2 passed 400 parts per million. By looking at what Earth’s climate was like in previous eras of high CO2 levels, scientists are getting a sobering picture of where we […]

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How Climate Change Could Jam The World’s Ocean Circulation

How Climate Change Could Jam The World’s Ocean Circulation Scientists are closely monitoring a key current in the North Atlantic to see if rising sea temperatures and increased freshwater from melting ice are altering the “ocean conveyor belt” — a vast oceanic stream that plays a major role in the global climate system. Mariusz Kluzniak/Flickr Melting […]

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Abrupt Sea Level Rise Looms As Increasingly Realistic Threat

Abrupt Sea Level Rise Looms As Increasingly Realistic Threat Ninety-nine percent of the planet’s freshwater ice is locked up in the Antarctic and Greenland ice caps. Now, a growing number of studies are raising the possibility that as those ice sheets melt, sea levels could rise by six feet this century, and far higher in the […]

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Olduvai IV: Courage
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Olduvai II: Exodus
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