Declines in yield and changes in suitability ranges for maize , sorghum  and wheat  in Mexico ; northward shifts in the suitable area for six crops from the central USA . Warming accompanied by increased CO2 may benefit crop production of small grains in southern Canada up to 3°C global warming level , although benefits decline after 2.5°C GWL. Increased CO2 enhances production but reduces forage quality in US-NP and US-NW. Without adaptation, 2ºC GWL increases insect-caused production losses ~36 and ~44% for maize and wheat, respectively.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report