- CO2 levels at highest for 3 million years: The last time CO2 levels were this high, Greenland was mostly green, sea levels were up to 20 meters higher and trees grew on Antarctica https://edition.cnn.com/2019/04/04/health/co2-levels-global-warming-climate-intl/index.html 954 comments worldnews
- CO2 levels at highest for 3 million years - when seas were 20 meters higher https://www.cnn.com/2019/04/04/health/co2-levels-global-warming-climate-intl/index.html 30 comments worldnews
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