All the volcanoes on earth put out an esitmated 200 million tons of CO2 into the biosphere each year. But each year, humans are responsible for an estimated 26.8 billion tons.
Where'd you get those figures? Humans emit more CO2 in DAYS than all the volcanoes on earth do in a normal year. The human contribution is on the order of 35 gigatons, while volcanoes contribute about 0.2.
http://www.agu.org/pubs/pdf/2011EO240001.pdf
Rare opportunity for a handshake here and a buddy hug. .2Gigaton is about 200Million.. Glad to help ya out.
Probably tho -- this isn't counting all the discovered and undiscovered undersea volcanic vents and nat gas fissures that END up being "natural" CO2 by the time it gets to the surface..
True, but that's still 1/175th of what humans put out. So in about 2.1 days we emit more than all the volcanoes on earth. He got one of the numbers right, but totally underestimated the other, making his premise entirely invalid.