Have sources to back that up factually?

Common sense. Volcanoes have been spewing gasses into the atmosphere since even before life on this planet. Do you really need a source for such an obvious truth? Use your brain and think about it.

I found this site about harmful gasses from volcanoes. What are you gonna do about this obvious health hazard? It's true that humans are doing more according to the study, but eliminating volcanoes would be a start.

http://volcanoes.usgs.gov/Hazards/Wh...as/volgas.html

Nowhere in that article does it say that volcanoes emit more poisonous gasses than human activities.

It may be "common sense" to you; but essentially its faulty logic. You see a volcano erupt and you think "oh my that's a lot of ash", then you see a car on the road and think "well, that's not a lot of exhaust", then you make the conclusion with your faulty logic that volcanoes emit more than humans. And I like how whenever you're asked of a source, you claim it to just be "common sense" and call us stupid for not agreeing with your unbacked hypothesis. From now on, and so long as you use it, I'm going to just claim to have a superior "common sense" and call you stupid for not agreeing with me everytime you ask for proof.

I don't think I've ever seen you adequately provide proof for anything when asked alias.