> Global estimates of the annual present-day CO2 output of the Earth’s degassing subaerial and submarine volcanoes range from 0.13 to 0.44 billion metric tons (

> Global estimates of the annual present-day CO2 output of the Earth’s degassing subaerial and submarine volcanoes range from 0.13 to 0.44 billion metric tons (gigatons) per year > Anthropogenic CO2 emissions—responsible for a projected 35 gigatons of CO2 in 2010 [Friedlingstein et al., 2010] — clearly dwarf all estimates of the annual present-day global volcanic CO2 emission rate. Gerlach, T., (2011), Volcanic versus anthropogenic carbon dioxide, Eos Trans. AGU, 92( 24), 201. https://earthscience.rice.edu/wp-content/uploads/2017/08/Gerlach2011_EOS.pdf https://earthscience.rice.edu/wp-content/uploads/2017/08/Ger...