evidence: The claim: One eruption of Mt. Etna in Italy released 10,000 times more CO2 than humans ever have [...] Etna has already put more than 10,000 times the CO2 into the atmosphere than mankind has in our entire time on Earth," reads text accompanying a picture of Mt. Etna in a June 6 Facebook post. [...] Based on our research, we rate FALSE the claim that one eruption of Mt. Etna in Italy released 10,000 times more CO2 than humans ever have. The 2015 eruption in question released less CO2 than what humans did just that year. Combined, volcanoes release less than one gigaton of CO2 per year, whereas humans release dozens of gigatons per year.