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聽"An atmosphere of that gas would give to our earth a high temperature; and if, as some suppose, at one period of its history, the air had mixed with it a larger proportion than at present, an increased temperature from its own action, as well as from increased weight, must have necessarily resulted." ~Eunice Newton Foote
If you ever ask yourself 'since when did we know that?' The answer is 1856. Not 1972, not 1997: 1856.
https://www.scientificamerican.com/article/the-woman-who-demonstrated-the-greenhouse-effect/
