RE: Studies prove link between human activity and extreme weather events
From the paper's abstract, this prediction simply relies on the fact that as the earth's atmosphere heats up, it stores more water. It assumes that the cause of this heating is due to man's influence and says it is proven simply because they can come up with computer models of man-caused global warming fit the precipitation patterns of the last 50 years or so.
There apparently is no consideration or refutation of the hypothesis that natural warming of the earth could have caused the same effect (of course, I don't know this for sure since even though this paper was largely funded by taxpayers, its contents are not freely available to the public).
