Without adaptation, climate change is projected to reduce overall yields of important North American crops   . For example, projected heat stress  reduced mid-century  maize and cotton yields by 12- 15% of historical yields , with the US-SW suffering the largest impacts . Warming and heat extremes will delay or prevent chill accumulation, affecting perennial crop development , yield  and quality   . Warming will alter the length of growing seasons of cold- season crops  and will shift suitability ranges of warm-season California crops   . Increasing atmospheric CO2 will enhance yields yet reduce nutrient content of many crops ; a CO2 concentration of 541 ppm  would reduce per-capita nutrient availability in North American diets by 2.5-4.0% . Crop pest and pathogen outbreaks are expected to worsen under climate change  .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report