The researchers studied changes in dry and wet climate boundaries in China over the past 50 years. They used data on precipitation, wind, and solar radiation to calculate aridity levels in different regions. They found that the boundaries between arid, semi-arid, and humid zones have shifted due to climate warming and changes in precipitation patterns. In some areas, the semi-arid zone has expanded, while in others it has contracted. Precipitation trends vary across different regions of China, with some areas experiencing more rain and others less. These changes are influenced by factors like monsoons and ocean currents.