Heat is one of the best-studied aspects of climate change observed to reduce well-being . Higher summer temperatures are associated with decreased happiness and ratings of well-being . A study of 1.9 million Americans  found that exposure to one day averaging 21°C-27℃ was associated with reduced well-being by 1.6% of a standard deviation and days above 32ºC were associated with reduced well-being by 4.4% of a standard deviation relative to a reference interval of 10°C-16°C. A similar relationship between heat and mood has been observed in China, where expressed mood began to decrease when the average daily temperature was over 20℃ . The causal mechanism is unclear but could be due to impacts on health, economic costs or social interactions  or reduced quality or quantity of sleep . Heat has also been associated with inter-personal and inter- group aggression and increases in violent crime . For the most part, studies have measured daily response to average daily temperatures and are unable to predict whether the effect is cumulative in response to a sequence of unusually warm days. However, there is no evidence that adaptation occurs over time to eliminate the negative response to very warm temperatures . Some research has found
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report