Climate change lowers soybean seed quality: study finds more beans but less protein and starch

A new study from the University of Sao Paulo shows that combined climate pressures from higher CO2, rising temperatures, and drought could increase soybean production by 50% but reduce key nutritional components. Researchers found a 20% drop in starch content and a 6% drop in protein content in soybeans exposed to all three stressors simultaneously. The study used AI-powered predictive modeling to estimate the triple impact, which would be difficult to test in a single experiment. Elevated CO2 alone acted as a fertilizer and helped plants cope with drought, but when combined with heat and water stress, the plant's metabolism shifted. Instead of storing energy as starch, the plant directed carbon toward building cell walls, resulting in beans with more fiber and less stored energy. These findings matter for global agriculture because soybeans are widely used in animal feed and food products. Lower protein content affects feed value, while the unexpected increase in amino acids raises new questions about how climate-stressed soybeans affect animals. The research highlights that combined climate stresses produce results that cannot be predicted by studying each factor separately.