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Published online 4 January 2006 | Nature | doi:10.1038/news060102-5
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Ocean currents flip out
Global warming millions of years ago put seas in a spin.
The circulation of the deep oceans reversed abruptly some 55 million years ago, according to a study of fossilized sea creatures. This rings alarm bells about today's climate change, because the reversal coincided with a period of global warming driven by greenhouse gases.
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