Earth’s CO2 level passes a new climate milestone
Concentrations of carbon dioxide in the atmosphere in May were 50 percent higher than during the pre-industrial era, reaching levels not seen on Earth for about four million years, the main US climate agency said on Friday.
The amount of carbon dioxide in the atmosphere passed the threshold of 420 parts per million (ppm), the National Oceanic and Atmospheric Administration (NOAA) said. Last May, the rate was 419ppm, and in 2020, 417ppm.
The level now is comparable to what it was between 4.1 and 4.5 million years ago, when CO2 levels were near or above 400ppm, the NOAA said. At that time, sea levels were between five and 25 metres higher than now, high enough to submerge many of today’s major cities. Large forests also occupied parts of the Arctic, according to studies.
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