Climate warming in China has shifted the northern limits of cropping systems and crop yields. By analyzing data from 1981 to 2007, researchers found that the northern limits of double cropping systems and winter wheat have moved northward. This shift has led to increased grain yields in certain regions, with potential yield increases of 54-106% for double cropping systems and 27-58% for triple cropping systems. The study also highlights the expansion of winter wheat cultivation in provinces like Hebei, resulting in a 25% increase in grain yield. Overall, the findings suggest that climate warming is impacting crop cultivation patterns and yields in China.