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The rise in atmospheric CO2 over the last century was clearly caused by human activity, as it occurred at a rate much faster than natural climate changes could produce.

Over the past 650,000 years, atmospheric CO2 levels did not rise above 300 ppm until the mid-20th century. [100] Atmospheric levels of CO2 have risen from about 317 ppm in 1958 to 415 ppm in 2019. [10] [194] According to the Scripps Institution of Oceanology, the “extreme speed at which carbon dioxide concentrations are increasing is unprecedented. An increase of 10 parts per million might have needed 1,000 years or more to come to pass during ancient climate change events.” [17] Some climate models predict that by the end of the 21st century an additional 5°F-10°F of warming will occur. [16]

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