In article ,
Mike Patterson wrote:

snip--

Nevermind the fact that a single volcanic eruption can dump more
"greenhouse" gases into the atmosphere in a week than the human race
has produced since the first hominoid climbed out of the trees,

this does not agree with the literature i have read
which states that the total CO2 emitted by volcanoes is approximately
150 times less than from human activity. a useful paper is

Gerlach, T.M., 1991, Present-day CO2 emissions from volcanoes:
Transactions of the American Geophysical Union (EOS), v. 72, p. 249,
and 254-255.

the immediate effect of major volcanic eruptions is cooling
due to sulfate aerosols, which was pointed out by James Hansen
as early as 1990 or so...

pinatubo was the verification of this hypothesis, infact the cooling from
pinatubo was exactly as predicted by climate models, crude as they were
back then...

sidd