Global statistics for death and loss of health are increasingly described in terms of burden, which describes gaps between a population's actual health status and what its status would be if its members lived free of disease and disability to their collective life expectancy . Burden for each disease/health outcome is estimated by adding together the number of years of life lost  by a person because of early death and the number of years of life lived with disability  from the considered outcome. The resulting statistic, the disability-adjusted life year  represents the loss of one year of life lived in full health. The total global burden of disease , expressed in DALYs, is what the world's health systems must manage and is reported annually in Global Burden of Disease Study . The estimated current global burden of climate-sensitive diseases and conditions described in this chapter, and the geographical regions most affected, are summarised in Table Box 7.2.1. As was observed in Chapter 11  of AR5, the 'background climate-related disease burden of a population is often the best single indicator of vulnerability to climate change - doubling of risk of disease in a low disease population has much less absolute impact than doubling of the disease when the background rate is high.'
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report