We examined the potential impacts of climate variability and chan on human health as part of a congressionally mandated study ofcimate change in the United States. Our author team, comprising experts from academia, govemment, and the private sector, was selected by the federal interagency U.S. Global Change Research Program, and this report stems fiom our first 18 months of work For this assessment we used a set of assumptions andlor projections offuture climates developed for alt participants in the National Assessment of the Potential Consequences of Climate Variability and Change. We identified five categories of health outcomes that are most likely to be