Comments on the process and product of the health impacts assessment component of the national assessment of the potential consequences of climate variability and change for the United States

In 1990 Congress formed the U.S. Global Change Research Program and require d it to conduct a periodic national assessment of the potential impacts of climate variability and change on all regions and select economic/resource sectors of the United States. Between 1998 and 2000, a team of experts coll aborated on a health impacts assessment that formed the basis for the first National Assessment's analysis of the potential impacts of climate on huma n health. The health impacts assessment was integrated across a number of h ealth disciplines and involved a search for and qualitative expert judgment review of data on the potential links between climate events and populatio n health. Accomplishments included identification of vulnerable populations , adaptation strategies, research needs, and data gaps. Experts, stakeholde rs, and the public were involved. The assessment is reported in five articl es in this issue; a summary was published in the April 2000 issue of Enviro nmental Health Perspectives. The assessment report will enhance understandi ng of ways human health might be affected by various climate-associated str esses and of the need for further empirical and predictive research. Improv ed understanding and communication of the significance and inevitability of uncertainties in such an assessment are critical to further research and p olicy development.