"Some places will see an increase in malaria prevalence and some places will see a decrease, due to the varying effects of climate change. California is set to be drier and warmer, so we shouldn't have any increase."

I figured I'd do some fact checking, for no other reason than that's what a lot of this thread is about:

From: http://diseasemaps.usgs.gov/

Cumulative 2009 Data as of 3 am, Dec 08, 2009*

Cumulative Mosquito West Nile Infections by State:

   New York: 100
   California: 1056
   Florida:  3

Population of New York is approximately twice that of California, so, on a per capita basis, Mosquito Infections of West Nile Virus are five (5) times more prevalent in California.

Florida has almost _no_ west nile infections (though they have a lot of mosquitos)

We need to be cautious about conflating disease and insect prevalence, as tempting as that may be.