O shit, I did a typo, "sceptic" instead of skeptic and if some want to use that to shoot down what I have to say so be it. However the rest of You may find this little experiment interesting For most the 40 years I worked I had access to IR Spectroscopy or just about any of the best analytical instrumentation (Government)-money could buy...as we all know they aren`t exactly as frugal as they claim to be. But I`m retired now and the best I can do is to use common household items to demonstrate why I am of the opinion that computer climate models are way off the mark. You can easily try this out Yourself and modify this black body back radiation experiment at will: http://www.youtube.com/watch?v=BpFsUdYZdUE&feature=youtu.be As You can see even a black coffee cup "radiation cavity" coated with black soot is a better reflector than the earth`s surface reflectivity climate science computer models assign to most of our planet . The higher the reflectivity the less energy of the incoming solar radiation gets changed to the lower wavelength (IR) that CO2 can absorb and back-radiate.... I thought this was a better way to demonstrate the back radiation objections many have, rather than arguing the statistical data that are being used trying to prove the validity of CO2 IR absorption and back radiation of black body frequency shifted incoming solar radiation. Maybe I`ll ask the U where I`m still an adjunct Professor to repeat this demonstration with "professional" lab equipment, but I think for now this should suffice.