"It rained here, it didn't rain there. There was snow here, there was a hurricane there. Those types of things are much more complicated," Mr. Knappenberger said. "The science isn't clear one way or the other how global warming is going to affect those things."
Paul Knappenberger, assistant director of the Cato Institute's Center for the Study of Science, said the report pokes holes in efforts to chalk up a variety of disparate weather events to climate change.