Atmospheric concentrations of carbon dioxide made history last month by climbing to their highest seasonal peak available in historical records, a team of researchers reported.

For the first time ever, these levels surpassed 430 parts per million (ppm) at the National Oceanic and Atmospheric Administration's (NOAA) Mauna Loa Observatory in Hawaii, which is considered the global benchmark site for tracking atmospheric carbon dioxide.

The 430.2 ppm calculation for May marked a 3.5 ppm increase over May 2024's reading........

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