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The idea of the greenhouse effect has been around for a while, as these New York Times articles show
June 21, 1958
August 6, 1960
September 25, 1955
December 21, 1969
So what if these warnings were taken seriously back then. What would be the response to mitigate rising temperatures? I'm guessing we'd have a lot more nuclear power, given that wind and solar power were not practical back then. And with no lithium-ion batteries and therefore no practical electric cars, we might have automobiles running on natural gas or propane.