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The work, published in late December in the Proceedings of the National Academy of Sciences, places human migration into a new context.
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New Princeton research shows that prehistoric megatooth sharks — the biggest sharks that ever lived — were apex predators at the highest trophic level ever measured.
The last million years of Earth history have been characterized by frequent “glacial-interglacial cycles,” large swings in climate that are linked to the growing and shrinking of massive, continent-spanning ice sheets. These cycles are triggered by subtle oscillations in Earth’s orbit and rotation, but the orbital oscillations are too subtle to explain the large changes in climate. “The cause of the ice ages is one of the great unsolved problems in the geosciences,” said Daniel Sigman, the Dusenbury Professor of Geological and Geophysical Sciences. “Explaining this dominant climat...
E-Mail IMAGE: Since the discovery that atmospheric carbon dioxide (CO2) concentrations were lower during past ice ages, the cause has been a mystery. Now, Princeton geoscientists Danny Sigman and Ellen Ai (seen... view more Credit: Laura Pedrick The last million years of Earth history have been characterized by frequent "glacial-interglacial cycles," large swings in climate that are linked to the growing and shrinking of massive, continent-spanning ice sheets. These cycles are triggered by subtle oscillations in Earth's orbit and rotation, but the orbital oscillations are too subt...