Sudden? Lol. Temps have fallen and risen ~1 K from around an average at 286 Kelvin every couple hundred years for at least the last 2,000 years. It helps to use the Scale that Heat Transfer is calculated in to gain a better context. Much ado about Nothing.
No one claims CO2 is the ONLY lever on temperature both now and in the past. The claim is that the other variables don't explain sudden temperature rises in modern times and CO2 does. Those other factors DO help explain the past, along with CO2.
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And let's not forget that the Greenland Ice Sheet melted almost completely during the 2 previous interglacials when CO2 never got above 280ppm. The other factors that "can't" explain the current variability explained greater variability in the past.
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I don't think anyone seriously disputes that, all other things being equal, more CO2 = higher temp. Issue is, how much? Current models assign way too much sensitivity to CO2, by assuming it leads to more H2O vapor. Catastrophe-mongering not warranted by CO2 increase.
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