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The first comprehensive study of changes in the oxygenation of oceans at the end of the last Ice Age (between about 10,000 to 20,000 years ago) has implications for the future of our oceans under global warming. The study looked at marine sediment and found that that the dissolved oxygen concentrations in large parts of the oceans changed dramatically during the relatively slow natural climate changes at the end of the last Ice Age. [Source: ScienceDaily]
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