“There are careers to be made by proving that any particular piece of this argument concerned with the global warming process is wrong. . . . any legitimate argument . . . is investigated . . . by legions of different scientists seeking to prove or disprove the validity of the argument . . . [Science] is a highly competitive process in which all ideas are tested because it is in the best interests of any scientist who can [demonstrate]. . . generally accepted wisdom . . . to be untrue. . .”