The relationship between carbon dioxide and climate over millions of years has been a source of controversy. Fossilized liverwort leaves can help illuminate both temperature and atmospheric carbon dioxide levels from 200 to 60 million years ago.
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Wallmann, K. Liverworts and all. Nature Geosci 1, 14–15 (2008). https://doi.org/10.1038/ngeo.2007.67
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DOI: https://doi.org/10.1038/ngeo.2007.67
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