Plant fossils can reveal the levels of carbon dioxide in the atmosphere at the time they lived

It’s well known that the current levels of carbon dioxide in the atmosphere are the highest they’ve been in a long time – but is that a few hundred years? Thousands? Millions? According to a new study of fossil plant matter, CO2 concentrations haven’t been this high in at least 23 million years, and have never shot up this fast.

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Category: Environment, Science

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