Waterborne diseases result from complex causal relationships between climatic, environmental and socioeconomic factors that are not fully understood or modelled  . WaSH-related health risks are related to extreme events, harmful algal blooms and WaSH practices . In addition, changes in thermotolerance and chlorine resistance of certain viruses have been observed in laboratory experiments simulating different temperatures and sunlight conditions , increasing potential health risks even where traditional water treatment exists  . Studies show that degraded water quality increases the willingness to pay for clean water regardless of national economic status. However, payment for clean, potable water, particularly in low- and middle-income countries, can represent a significant percentage of people's income, limiting economic well-being and the possibility for re-investment in other livelihoods or activities .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report