Facts hard for you? The IPCC's AR are filled with evidence supporting AGW. That is a fact. The proportion of published literature providing evidence to refute AGW, compared only to that science referenced in the ARs, is measured in the thousandths (if that). Your position is logically and - considering the effect your choices are willfully attempting to produce for my children - morally, insupportable.
Right, but we have no data even telling when those experiments were done, and they may have noticed a starting trend and doubled down on it.
Oh, there is data. Warmers just choose to ignore it. Tyndall, one of the so called "fathers" of the greenhouse hypothesis had this to say regarding carbonic acid gas...or as we know it CO2.. "Carbonic acid gas is one of the feeblest of absorbers of the radiant heat emitted by solid sources" That was in reference to experiments where he passed "calorific rays" (infrared radiation) through copper tubes filled with various gasses to see how they reacted.....how much they absorbed and how much they radiated...and he was working with concentrations in the range of 80,000ppm... He characterized CO2 as one of the feeblest absorbers of infrared radiation but warmers simply ignore that inconvenient bit of scientific history.
He further noted, in reference to the behavior of CO2 in his experiments..." Through air . . . the waves of ether pass without absorption, and these gases are not sensibly changed in temperature by the most powerful calorific rays". Meaning that even when he cranked up the heat, the temperature of CO2 didn't change in any significant way.