Humans Produce 2 Billion Tons of CO₂ a Year
A new study estimates that collective human metabolism produces 2 billion metric tons of CO₂ annually, with population growth accounting for over 60% of the 74% increase between 1985 and 2015
A global study has estimated that collective human metabolism produces 2 billion metric tons of CO₂ a year. The research, led by professor Javier Gonzalez from the University of Bath's Center for Exercise, Nutrition and Metabolism, found that the amount of CO₂ produced by humans rose by 74% between 1985 and 2015.
The study, published in The Lancet Planetary Health, used thousands of real-world measurements of people from infancy to old age to measure metabolism in everyday life. The researchers found that the amount of CO₂ produced by people worldwide was 1.18 billion metric tons in 1985, increasing to 2.05 billion metric tons in 2015.
Population growth accounted for more than 60% of the increase in CO₂ production, according to the study. This suggests that the growing global population is a significant contributor to the rise in CO₂ emissions from human metabolism.
The study's findings could help scientists better understand where carbon comes from, where it goes, and how human activity fits into the bigger picture. The CO₂ people breathe out is not the same as emissions from burning fossil fuels, as it comes from the food we eat and is largely carbon that plants have recently taken from the atmosphere.
## Why it matters The research provides a new piece of the puzzle for scientists working to understand the global carbon cycle. By accounting for the CO₂ produced by human metabolism, researchers can more accurately predict the effectiveness of carbon reduction strategies. This information can ultimately help inform policies and initiatives aimed at reducing greenhouse gas emissions and mitigating the impacts of climate change.
The study's lead author, professor Javier Gonzalez, noted that the increase in CO₂ production is mainly due to the growing global population. This highlights the need for sustainable population growth and development strategies that balance human needs with environmental protection.
The findings of the study have significant implications for global efforts to reduce carbon emissions and address climate change. As the global population continues to grow, it is essential to consider the impact of human metabolism on the environment and to develop strategies that minimize this impact.
