It’s unclear exactly what happened 252 million years ago as the planet warmed, but 90 percent of species went extinct.
— Read on www.bloomberg.com/opinion/articles/2018-12-21/lessons-on-global-warming-from-prehistoric-end-permian-extinction
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jpratt27 
One lunatic was posting a long comment below the article as if he was familiar with the science. Turning out his copy/paste job must be about 20 years old. Some die-hard deniers seem to never go extinct.
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Historical and current CO2 levels
=> https://www.co2levels.org/
=> https://www.skepticalscience.com/Climate_Carbon_Bookkeeping.html
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