@oralloy,
Eunice Newton Foote, an American scientist, physicist, inventor, and women's rights campaigner from Seneca Falls, NY, experimented with glass tubes of different gases exposed to sunlight in 1856. She noted that the warming effect of the sun was greater for compressed air than for an evacuated tube, and greater for moist air than dry air. "Thirdly, the highest effect of the sun's rays I have found to be in carbonic acid gas." (carbon dioxide)
She continued: "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."
In 1859, Irish physicist John Tyndall investigated the absorption of infrared radiation in different gases. He found that water vapor, hydrocarbons like methane (CH4), and carbon dioxide (CO2) strongly blocked the radiation, while oxygen did not.
In 1896 Swedish chemist Svante Arrhenius calculated the effect of a doubling atmospheric carbon dioxide to be an increase in surface temperatures of 5–6 degrees Celsius.
So you think they faked their data huh? Why don't you expose some glass tubes to sunlight, just to check?