Currently 30% of the global population is exposed to deadly heat waves and this percentage by 2100 is projected to increase to ~48% under a drastic mitigation scenario to ~74% under a scenario of growing emissions. . Heat stress contributes to deaths and health problems among the elderly and children. Specifically, heat stress is currently responsible for 38,000 annual deaths mostly among the elderly, and 48,000 from diarrhoea, 60,000 from malaria and 95,000 from childhood undernutrition .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report