Considering that human activity released some 30 Gt CO2 into the atmosphere last year, human emissions are likely 100 (or more) times as large as volcanic emissions. Those who make claims about the Mt. Pinatubo explosion emitting more CO2 than all of human activity for all time, should be made aware that the estimated CO2 emissions from Mt. Pinatubo are 0.05 Gt CO2, about the amount released by human activity in half a day, not our entire history. In fact, in less than 3 days we outstrip the volcanic emissions for an entire year:
On average, humanity’s ceaseless emissions release an amount of CO2 comparable to the 0.01 gigaton of the 1980 Mount St. Helens paroxysm every 2.5 hours and the 0.05 gigaton of the 1991 Mount Pinatubo paroxysm every 12.5 hours. Every 2.7 days, they emit an amount comparable to the 0.26 gigaton preferred estimate for annual global volcanic CO2 emissions.
from terrence gerlach, vulcanologist usgc
but hey, check it out yourself
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