If there's a scientific refutation of William Happer's work, I have yet to see it. CO2 isn't a black hole, it is not an infinite heat sink - there should be a saturation point. According to his analysis, we've already achieved it: there is already enough CO2 in the atmosphere to block the pertinent spectrum of ultraviolet radiation from the sun. In other words, global warming was a 20th century phenomena that once existed but no longer does. If some other atmospheric physicist has found a flaw in Mr. Happer's analysis, please provide the link.