I'm sorry Frank, but that is utter nonsense. I'm not sure where the lot of you got this idea that no lab experiment has ever demonstrated the greenhouse effect, but it is wrong and you all look a lot of idiots spouting it over and over again. How difficult do you believe it to be to determine and demonstrate the absorption and emissions spectra of carbon dioxide or any other gas? Where do you think the idea of the greenhouse effect came from? Someone's fertile imagination?
Frank is absolutely correct. There is zero empirical data to support the idea that a 200ppm increase in CO2 can do anything. There are computer models that claim it...but as we have seen from the Harvard study those models are "close to useless" (their words) so that leaves you where?
With an unsubstantiated claim...