Global Warming and Volcanoes

I believe I read this correctly. I was scanning through the book Snowball Earth and found a statement that human's contributions to global warming is far less than volcanoes. The very same day I was talking to a friend about something related to geology or earth resources when he mentioned that volcanoes produce way more pollutants than humans. Perhaps he was just uttering a fact that he had heard, or maybe he was trying to say something about GW. I don't know. I'm no earth scientist, but did later read that humans are fully responsible for 1/2 of the contaminants that cause GW. Maybe the debris volcanoes spew settles quickly into the oceans or contains less of the GW contaminants? Anyway, is there a source that will straighten me out on this.?

Wayne T. Watson (Watson Adventures, Prop., Nevada City, CA)
(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet
--
"Nature invented space so that everything didn't
have to happen at Princeton." -- Martin Rees,
Britain's Royal Astronomer, in a lecture at Princeton

Web Page: <home.earthlink.net/~mtnviews>

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