Human Exhalation May Contribute to Global Warming, Study Suggests

Methane and nitrous oxide in human breath could account for up to 0.1% of the UK's greenhouse gas emissions, according to new research.

New research from the British journal PLOS One suggests that human exhalation may contribute to global warming due to small, elevated concentrations of methane (CH4) and nitrous oxide (N2O).
The study found that these gases make up nearly 0.1 percent of the UK's greenhouse gas emissions.
Of the 104 volunteers who took part in the study, every individual breathed out nitrous oxide, with 31 percent of the human beings studied breathing out methane.
The study's authors suggest that there may still be a small but significant unaccounted-for source of N2O emissions in the UK, which could account for more than 1% of national-scale emissions.
The study did not find a significant link between diet and the concentration of CH4 and N2O in exhaled breath.