Citat:
Forskningen går framåt:Jag tror att du har hoppat över Pliocen epoken där koldioxidhalten var jämförbar med dagens nivåer.
Till och med NASA skriver om detta på sin hemsida.
https://climate.nasa.gov/climate_resources/7/graphic-carbon-dioxide-hits-new-high/
Till och med NASA skriver om detta på sin hemsida.
https://climate.nasa.gov/climate_resources/7/graphic-carbon-dioxide-hits-new-high/
Today's atmospheric carbon dioxide levels greater than 23 million-year record
This new study used a novel method to conclude that today's carbon dioxide (CO2) levels are actually higher than they have been for the past 23 million years.
…
Furthermore, Schubert and colleagues' new CO2 "timeline" revealed no evidence for any fluctuations in CO2 that might be comparable to the dramatic CO2 increase of the present day, which suggests today's abrupt greenhouse disruption is unique across recent geologic history.
https://www.sciencedaily.com/releases/2020/06/200601194144.htm
Across the past 23 m.y., CO2 likely ranged between ∼230 ppmv and 350 ppmv (68% confidence interval: ∼170–540 ppm).
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