Under 2°C warming and beyond, rain-fed wheat yield in most locations could decline by 2-59%, depending on agricultural practices . Under 1.5-3ºC warming and reduced rainfall, yield decreases are also projected for maize  and barley , mainly due to the shortening of the crop growing season by up to 30 days due to higher temperatures . In Tunisia, cereal production may decrease by 0.79% with a 1% decrease in precipitation . Reductions of rice yields in parts of the region are projected in the absence of adaptation; for example, by 6-20% in southern France and Italy in 2070 under RCP8.5 .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report