Climate change has caused regionally different, but mostly negative, impacts on crop yields and quality and marketability of products  . There is medium evidence and high agreement that the effects of human-induced climate warming since the pre-industrial era has had significantly negative effects on global crop production, acting as a drag on the growth of agricultural production . One global study using an empirical model estimated the negative effect of anthropogenic warming trends from 1961 to 2017 to be on average 5.3% for three staple crops  . Another study using a process-based crop model found a yield loss of 4.1%  for maize and 4.5%  for soybean between 1981 and 2010 relative to the non-warming condition, even with CO2 fertilisation effects . Human-induced warming trends since 1961 have also slowed down the growth of agricultural total factor productivity by 21% . Regionally, heat and rainfall extremes intensified by human-induced warming in West Africa have reduced millet and sorghum yields by 10-20%, and 5-15%, respectively .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report