We first understood the greenhouse effect back in 1859, with...

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    We first understood the greenhouse effect back in 1859, with John Tyndall's work.
    https://en.wikipedia.org/wiki/John_Tyndall#Main_scientific_work

    And by 1896 Arrhenius had calculated how human emissions could affect global temperatures.
    https://en.wikipedia.org/wiki/Svante_Arrhenius#Greenhouse_effect

    If you want to test it, try living on Mars with a very thin greenhouse atmosphere. It's cold.
 
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