Atmospheric CO2 Hits 431 ppm in April 2026, Setting a New Monthly Record, as the Observatory That Measures It Faces Defunding
April 2026 set a new monthly record for atmospheric CO2 at 431.12 ppm—the highest in over two million years—while the Trump administration's FY2027 budget proposes eliminating NOAA's climate research funding entirely, threatening the 68-year Mauna Loa record.
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