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