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Carbon dioxide levels are higher than humans have ever experienced. It could be changing our blood chemistry | CNN Larcombe and his colleague Philip Bierwith, emeritus research associate at Australian National University, analyzed more than two decades of US health data and discovered shifts in people’s blood chemistry that appear to mirror the rise of atmospheric carbon dioxide. The scientists used the US National Health and Nutrition Examination Survey, which collected a slew of health information from roughly 7,000 Americans every two years between 1999 and 2020. It’s “the most comprehensive (dataset) by far in terms of blood chemistry,” Larcombe said. https://edition.cnn.com/2026/03/19/climate/carbon-dioxide-blood-chemistry-public-health-climate-change #ClimateChange