Human metabolism released an estimated 2.05 billion tonnes of CO2 in 2015, study finds

Human metabolism produced an estimated 2.05 billion metric tons of carbon dioxide in 2015, up 74% from 1.18 billion metric tons in 1985. A modelling study led by the University of Bath and published in The Lancet Planetary Health attributes more than 60% of that rise to population growth rather than to any large cha…