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As a means of raising atmospheric CO2, the way that nature accomplishes it (flood volcanism with hundreds of square miles inundated under lava such as created the Siberian and Deccan traps) is a much harder on the environment than humans burning oil and coal. When the Siberian traps were created during the Permian era, it raised atmospheric CO2 from 400 ppm to 1800 ppm, 90% of life went extinct from volcanic ash falls, acid rains, “nuclear“ winter cold and darkness. But flood volcanism events are becoming less common than in the past as the earth’s interior gradually cools.
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