Human bodies produce 2 billion metric tons of CO2 a year just by staying alive

Science Daily | Sat, 07 Nov 2026 05:00:03 EST

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,…

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