The study looked at how different types of land in China changed from 1984 to 2012, like forests, farms, and cities. They found that forests and farms got smaller, while cities got bigger. This happened because of how much money was made in each area and the rules about using the land. Some regions had bigger changes than others, like Jiangsu-Zhejing-Shanghai and Beijing-Tianjin-Hebei. The way money was spent, how many people lived in an area, and how much money each person made all affected how the land changed. Overall, the way China used its land in the past 30 years wasn't good for the environment or farming.