Hansen Says That CO2 Feedback Is Critical For An Ice Age To Occur

CO2 needs to get very low to have an ice age (i.e. 200 ppm) – which is why the Ordovician had an ice age at 4,000 ppm.

 

About Tony Heller

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2 Responses to Hansen Says That CO2 Feedback Is Critical For An Ice Age To Occur

  1. gator69 says:

    “CO2 needs to get very low to have an ice age (i.e. 200 ppm) – which is why the Ordovician had an ice age at 4,000 ppm.”

    That was when our sun was only lukewarm. Astrophysicists say so.

  2. greg2213 says:

    There was no life back then. with 4k CO2, not to mention higher methane, the temps would have been roughly 20 degrees higher than today. People fry at a +4 increase. Clearly the idea that there was an ice age back then has been greatly exaggerated.
    /sarc_off

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