Annual economic output losses in developing countries could exceed the worst country-level losses during historical economic recessions . Assuming global warming of ~4°℃ by 2100, historical adaptation levels and high vulnerability, losses across Sub- Saharan Africa may reach 12% of GDP by 2050  and 80% by 2100 , and ~9% on average across developing countries by 2100 . The largest estimates are debated and depend on assumptions about development trends, adaptive capacity, and whether temperature impacts the level or growth rate of economic activity . Severe risks are more likely in  developing countries because of nonlinearities in the relationship between economic damages and temperature . These risks are highest in scenarios and countries with: a large portion of the workforce employed in highly exposed industries ; a high concentration of population and economic activity on coastlines ; and an increase in the frequency or intensity of disasters triggered by natural hazards . Whether baseline economic growth may help avoid severe future risks is highly uncertain .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report