Well, since we know that the human population is increasing, and since we know that people tend to cluster together with their families and friends - i.e., individuals are not uniformly dispersed across the entire surface, wet or dry, of the planet, it would stand to reason that the number of people affected by any given weather event would increase, even if the number and severity of weather events is stable or even slightly decreasing.
In short, "no duh!" And this has nothing to do with climate change.
