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elusive trigger for cooling 13,000 years ago might have been found
ice ages
ice sheets
paleoclimate
技术
科学
源
oldest antarctic ice ever found shows climate of 2.7 million years ago
antarctica
ice ages
ice cores
技术
科学
源
pesky glaciers and differing geography forced faster conifer evolution in northern hemisphere
botany
conifers
evolution
ice ages
plants
科学
源
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