Here is a short article but an idea I have not heard before -- that global warming is changing our blood chemistry.
--Kim
A groundbreaking study of U.S. population data suggests rising atmospheric carbon dioxide is already altering human blood chemistry, potentially reaching the limits of healthy ranges within decades.
In a striking revelation that extends the threat of climate change deep into human biology, scientists have discovered that rising global CO2 levels may already be shifting our blood chemistry.
Analyzing over two decades of U.S. health data from the National Health and Nutrition Examination Survey, researchers tracked blood markers in thousands of Americans between 1999 and 2020.
They found that as atmospheric CO2 climbed from 369 to over 420 parts per million, average serum bicarbonate levels—which help maintain the body's acid-base balance—rose by seven percent, while calcium and phosphorus levels steadily declined. This mirroring effect suggests our bodies are actively trying to compensate for an atmosphere changing faster than we can adapt.
While these subtle physiological shifts do not mean immediate illness, researchers warn of long-term consequences, particularly for children who face a lifetime of cumulative exposure. Projections show that if current emissions trends continue, average human bicarbonate levels could push past the boundaries of today's accepted healthy range within 50 years, while vital minerals like calcium and phosphorus may fall to worrisome lows.
These findings demand a major shift in how we view climate policy. CO2 is no longer just an environmental metric or weather driver—it is a long-term public health variable that directly threatens human biology, underscoring an urgent medical incentive to curb emissions.
source: Larcombe, A. N., & Bierwirth, P. N. (2026). Carbon dioxide overload, detected in human blood, suggests a potentially toxic atmosphere within 50 years. Air Quality, Atmosphere & Health.
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