Climate impacts for the past 20-50 years differ by crops and regions. Positive effects have been identified for rice and wheat in Eastern Asia, and for wheat in Northern Europe. The effects are mostly negative in Sub-Saharan Africa, South America and Caribbean, Southern Asia, and Western and Southern Europe. Climate factors that affected long- term yield trends also differ between regions. For example, in Western Africa, 1ºC warming above preindustrial climate has increased heat and rainfall extremes, and reduced yields by 10-20% for millet and 5-15% for sorghum . In Australia, declined rainfall and increased temperatures reduced yield potential of wheat by 27%, accounting for the low yield growth between 1990 and 2015 . In Southern Europe, climate warming has negatively impacted yields of almost all major crops, leading to recent yield stagnation .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report