Humans exhale 2 billion tons of CO2 yearly just by breathing

Researchers have calculated that human bodies collectively release over 2 billion metric tons of carbon dioxide each year simply by converting food into energy. That figure marks a 74% increase over the past 30 years, driven mainly by population growth. Unlike the CO2 from burning fossil fuels, the carbon dioxide we exhale is part of Earth's natural carbon cycle. Scientists suggest that more precise measurements of this metabolic output could help refine climate models, distinguishing natural from human-caused emissions more clearly.

Had you ever considered how much CO2 our own bodies contribute to the atmosphere?

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