# Collective human metabolism produces 2 billion metric tons of CO₂ a year, global study estimates

- Source: Phys.org - latest science and technology news stories
- Published: 2026-11-01T22:00:01+00:00
- Category: Science
- Original: https://phys.org/news/2026-10-human-metabolism-billion-metric-tons.html
- Canonical: https://groundlevelnews.com/story/collective-human-metabolism-produces-2-billion-metric-tons-of-co-a-yea-5a234f/

A University of Bath–led study has estimated that the carbon dioxide produced by humans as our bodies turn food into energy rose by 74% between 1985 and 2015, reaching 2.05 billion metric tons a year. Researchers say the findings could help scientists better understand where carbon comes from, where it goes and how human activity fits into the bigger picture.

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