CO2 now comparable to levels seen 4 million years ago: NOAA

CO2 Past

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CO2 levels make largest recorded annual leap, Noaa data shows, Climate crisis

environment - Are we in a low CO2 period, compared to the last 590 million years? - Skeptics Stack Exchange

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CO2 now comparable to levels seen 4 million years ago – NOAA – FrontPage

Climate Change: Atmospheric Carbon Dioxide

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NOAA Climate.Gov - Teaching Climate? This animated visualization represents a time history of atmospheric carbon dioxide in parts per million (ppm) from 1979 to 2016, and then back in time to 800,000

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Carbon dioxide now more than 50% higher than pre-industrial levels

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