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

CO2 Past

Earth's Atmosphere Passes Significant Carbon Milestone - Dan's Wild Wild Science Journal - AGU Blogosphere

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

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

Earth's atmosphere now has carbon dioxide levels unseen for 15 million years, and we might be past the point of no return

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

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Global Temperature and CO2 levels over 600 million years (Source

USA

Carbon dioxide has hit a level not seen in four million years. This is what it means for the world