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First plants cooled the Ordovician
Nature Geoscience 5,86–89(2012)
doi:10.1038/ngeo1390 Timothy M. Lenton,
Michael Crouch,Martin Johnson, Nuno Pires & Liam Dolan
The Late Ordovician period, ending 444 million years ago, was marked by the onset of glaciations. The expansion of non-vascular land plants accelerated chemical weathering and may have drawn down enough atmospheric carbon dioxide to trigger the growth of ice sheets.
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