Man vs the Volcano

I have heard climate change skeptics refer to a vague statistic that volcanoes emit more greenhouse gasses than humans. The implication being that we humans can't possibly compete with Mother Nature, so we might as well not try. Well, with the recent eruption of Eyjafjallajokull (try saying that one three times fast), I figured it was an opportune time to check the validity of this information. It turns out that the volcano spews out about 150,000 tons per day, whereas "aviation in 32 European nations emitted 510,000 tonnes a day of CO2 in 2007." That's almost four volcanoes of this size that have to erupt in order to meet the amount of emissions spewed by European aviation alone. In fact, it turns out that, on average, all of the volcanoes in the WORLD only release about 274,000 tons of CO2 per day. I think this myth is debunked.

Actually, here is an article that directly addresses the myth: http://www.scientificamerican.com/article.cfm?id=how-do-volcanoes-affect-w

And here are my sources for the recent eruption and blah blah blah...
http://www.google.com/hostednews/afp/article/ALeqM5iFlK7AFMG1W1EKOCEcsMnheg0oow
http://www.alertnet.org/thenews/newsdesk/LDE63J0MV.htm