In his Aug. 6 op-ed, "A New Climate-Change Consensus," Environmental Defense Fund President Fred Krupp speaks of "the trend—a decades-long march toward hotter and wilder weather." We have seen quite a few such claims this summer season, and Mr. Krupp insists that we accept them as "true." Only with Lewis Carroll's famous definition of truth, "What I tell you three times is true," is this the case.

But repetition of a fib does not make it true. As one of many pieces of evidence...