Quote:
Originally posted by nota
on volcano gas amounts aka produced natually
''''A highlight of the outgassing theory of Khilyuk and Chilingar (2006) is their comparison of the total anthropogenic carbon dioxide emission of 1.003 × 1018 g with the hypothesized total mass of CO2 degassed from the mantle throughout geologic history of 4.63 × 1023 g. This is used to declare that the total anthropogenic CO2 emission “constitutes less than 0.00022% of the total CO2 amount naturally degassed from the mantle during geologic history” and conclude that “the anthropogenic carbon dioxide emission is negligible (indistinguishable) in any energy-matter transformation processes changing the Earth’s climate”. It seems that the authors forgot to take the time factor into account. The anthropogenic emission happened during 200 years, whereas the natural degassing during geologic history spanned 4.5 billion years. Thus, the above numbers yield a yearly anthropogenic flux that is about 50 times larger than the mantle degassing flux, which hardly is negligible. It appears that the authors assume that the 4.63 × 1023 g of CO2 degassed from the mantle all remained in the atmosphere. Yet, the present day atmosphere contains less than 3 × 1018 g of CO2, and compared to this number the total anthropogenic CO2 emission of 1 × 1018 g certainly is significant.''''
short version
the claim that volcanos put out more CO2 then man has
is true over 4.5 billion years
but false over the last 200 years
man has added 1/3 of the CO2 currently in the air
and about 50 times more then resent volcanos put into the air
over the last 200 years
from
Environmental Geology
International Journal of Geosciences
. Springer-Verlag 2006
10.1007/s00254-006-0519-3
and yes thats peer reviewed science
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Yes, that was a lame argument. However, as 125shifter pointed out, human CO2 emmissions are not critical, as humiidty overshadows the effects of CO2. So the argument you present is somewhat moot. That's the whole point.