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Rising carbon dioxide levels now detected in human blood
— Phys Org
Rising carbon dioxide levels are being detected within the human body, with new research warning a key blood marker for the gas could near its healthy limit within decades if current trends continue. The findings are especially relevant for children and adolescents, whose developing bodies will experience the longest cumulative exposure to rising atmospheric CO₂.
Using data from the U.S. National Health and Nutrition Examination Survey (NHANES), the team examined blood results from around 7,000 people every two years between 1999 and 2020.
Average levels of serum bicarbonate — a marker closely linked to carbon dioxide in the body — have risen by approximately 7% since 1999. Over the same period, average calcium and phosphorus levels have declined.

