The amount of greenhouse gases released by one volcano eruption...
> 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/Ger...
To be clear, volcanoes do not contribute more CO2 annually than humans do.
https://skepticalscience.com/volcanoes-and-global-warming-in...
"Volcanoes emit around 0.3 billion tonnes of CO2 per year. This is about 1% of human CO2 emissions which is around 29 billion tonnes per year."
https://www.climate.gov/news-features/climate-qa/which-emits...