The concentration of carbon dioxide in Earth’s atmosphere reached historic levels in May after emissions plunged in the first months of the coronavirus pandemic, according to data released Monday by the Scripps Institution of Oceanography and the National Oceanic and Atmospheric Administration (NOAA).

The annual peak reached 419 parts per million (PPM) in May, according to the research, with “no discernible signal in the data” from the reduced industrial activity in 2020.

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