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CO2 Currently Rising Faster Than The PETM Extinction Event "The Paleocene-Eocene Thermal Maximum (PETM) was a period of natural global warming that took place almost 56 million years ago.  It came at a time when the atmospheric concentration of CO2 was already higher than today, and global temperatures also much warmer. The PETM warming was a roughly 200,000-year long event where global temperatures rose by a further 6–8°C, and is thought to have been caused by a massive injection of CO2 into the atmosphere." https://skepticalscience.com/co2-rising-ten-times-faster-than-petm-extinction.html

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