Breathing contributes to global warming – study

Methane and nitrous oxide found in human exhalations are worse for the environment than carbon dioxide, scientists say.

Human breathing contributes to global warming, according to a study published Wednesday in PLoS One. The authors argued that human respiration’s contribution to climate change has been underestimated and merits further study.

After measuring the gas composition in the exhaled breaths of 328 study participants, the researchers concluded human breath comprises 0.05% of the UK’s methane emissions and 0.1% of its nitrous oxide. Both of those gasses “have a much higher global warming potential than carbon dioxide,” the study notes.

“Exhaled human breath can contain small, elevated concentrations of methane (CH4) and nitrous oxide (N2O), both of which contribute to global warming,” the researchers, led by atmospheric physicist Nicholas Cowan of the UK Centre for Ecology and Hydrology, wrote. “We would urge caution in the assumption that emissions from humans are negligible.”

While Cowan explained that “CO2 contribution in human breath to climate change is essentially zero” because plants absorb nearly all the carbon dioxide humans breathe out, the other two gasses are left in the atmosphere. Methane traps 80 times the amount of heat as carbon dioxide during its first 20 years in the atmosphere, though this potency decreases over time.

https://www.rt.com/news/589091-human-breathing-global-warming-study/