Climate change affects agricultural labour productivity through increased intensity and frequency of heat stress events, with those performing physical labour in high humidity and ambient temperatures most vulnerable to heat stress  . Labour capacity, supply and productivity loss in moderate outdoor work due to heat stress is estimated between 2% and 14%, depending on the location and indicator , with an overall estimate of 5.3% loss in productivity for outdoor work between 2000 and 2015   but as high as 14% in low-income tropical countries . Highly vulnerable occupation groups affected by heat stress include farmers, farmworkers and livestock keepers working outdoors in low-income tropical countries  . Farmworkers and small-scale food producers in high- and middle-income countries involved in outdoor labour are also affected by heat stress . There is also evidence that heat stress is affecting labour supply through variation in nutrition intake .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report