Will atmospheric CO₂ concentrations reach 450 ppm (YES) or 400 ppm (NO) first?
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Will the average monthly level of CO2 in Earth's atmosphere reach 450 ppm (YES) or 400 ppm first?

Carbon dioxide measured at NOAA’s Mauna Loa Atmospheric Baseline Observatory peaked for 2022 at 421 parts per million in May.

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Looks like at present trends this will take at least 5 years to resolve.

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