Human bodies produce 2 billion metric tons of CO2 a year just by staying alive
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https://www.sciencedaily.com/releases/2026/11/261104012305.htm
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Humans collectively produce more than 2 billion tonnes of carbon dioxide annually just by turning food into energy, a 74% increase over three decades largely driven by population growth. Unlike fossil fuel emissions, however, the CO2 we exhale is part of the natural carbon cycle, and scientists say measuring it more accurately could improve climate models.
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