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Old 23rd Dec 2019, 20:21
  #104 (permalink)  
WingNut60
 
Join Date: Dec 2010
Location: Balikpapan, INDONESIA
Age: 68
Posts: 535
Originally Posted by De_flieger View Post
People keep saying that, but repeating it doesn't make it true.

----copy pasted from an earlier discussion on this topic, but still relevant ----
Forbes has an article that discusses this How much CO2 does a single volcano emit , which has figures of approximately 645 million tons of CO2 emitted every year due to volcanic activity in various forms (volcanic eruptions, mid ocean tectonic ridge activity and a few other things that are technically volcanic activity, while not being the traditional idea of an erupting volcano). That sounds like a lot, until it is compared to calculated level of human CO2 emissions in the last year, being approximately 37 billion tons of CO2.

Their article looks at the CO2 emitted by some of the very large, infrequent eruptions that make the headlines and people are aware of, and to match the levels of CO2 currently produced by human activity each day they point out that "It would take three Mount St. Helens and one Mount Pinatubo eruption every day to equal the amount that humanity is presently emitting.".

The US Geological Survey also discusses this here Volcanoes can affect the Earth's climate , with similar figures and conclusions. In short, volcanoes produce CO2, however the global contribution of volcanic activity to atmospheric CO2 is around the 1% mark, give or take, depending on how various forms of volcanic activity are calculated and what year is used as the baseline for the human contribution. Basically, it's a myth that volcanoes produce more CO2 than human activity, the true figure is that humans produce approximately 100 times more in recent years.
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