Atmospheric CO₂ reaches a minimum recorded in Antarctic ice

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Ice cores from Antarctica record a decline in atmospheric carbon dioxide through the late sixteenth century to a minimum around 1610. Lewis and Maslin proposed in 2015 that the dip is the atmospheric trace of the American population collapse, as tens of millions of hectares of managed land reverted to vegetation, and put it forward as a candidate marker for the start of the Anthropocene. The attribution and the boundary are both contested, and the stratigraphic community subsequently favoured a mid-twentieth-century marker.

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