Volcanic CO2 was, even at the time of this 2009 article, not even 1% of human-caused CO2. As the article further explains, SO2's role is complex and its net effect may be cooling rather than warming.
"Are Volcanoes or Humans Harder on the Atmosphere?": Does one major volcanic eruption generate more climate-altering gas than that produced by humans in their entire history?, Scientific American, February 11, 2009
So, given ‘Off-the-charts records’: has humanity finally broken the climate? Damian Carrington, Nina Lakhani, Oliver Milman, Adam Morton, Ajit Niranjan and Jonathan Watts, in The Guardian, 28 Aug 2023
Analysis: Why scientists think 100% of global warming is due to humans | @hausfath.bsky.social #CBarchive Read here: bit.ly/3g1vEtL
— Carbon Brief (@carbonbrief.org) October 28, 2025 at 11:42 AM
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