This chart shows carbon dioxide levels for different times in Earth’s history.

This chart shows carbon dioxide levels for different times in Earth’s history.

This chart shows carbon dioxide levels for different times in Earth’s history, in parts-per-million by volume, with projections for the next 100 years by the Intergovernmental Panel on Climate Change. A new study in Science by Aradhna Tripati and colleagues suggests that the last time carbon dioxide levels were as high as today was between 15-20 million years ago.

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