Rosetta findings challenge comet origin of Earth's water
European Space Agency's Rosetta studied comet 67P Churyumov-Gerasimenko finding water richer in deuterium than Earth's. Researchers debate if asteroids or Earth's own reserves supplied water, with some experts disclaiming comets as the main source.
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Kathrin Altwegg
University of Bern
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Michael Ahearn
NASA
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Donald Yeomans
Zero emissions goal gains global uptake at Lima talks
Farhana Yamin promotes an emissions phase out by 2050 as a path to zero net greenhouse gases. Leaders from Norway and other governments back net zero or phase out ideas, while critics warn of energy access gaps and tech hurdles.
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Yamin
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New York
DiCaprio
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Intergovernmental Panel On Climate Change
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