The authors conducted a systematic review of the studies of disability-adjusted life years (DALYs) lost because of climate change. The review considered both methodological issues and research results. It found that little is known about DALYs lost because of climate change, except for results based on limited information presented in the World Health Organization (WHO) global-burden-of-disease study in 2002. The measurement of DALYs attributable to climate change presents additional difficulties over measurement of DALYs attributable to other causes. Further studies linking DALYs and climate change should be conducted in various populations and in different ecological regions, including developing countries.