In the study of the Three Rivers Source Region's grasslands, researchers aimed to understand how these ecosystems store carbon and respond to climate change. They analyzed data from 1985 to 2018 using different methods. Their findings show that the grasslands were a weak carbon sink, meaning they stored more carbon than they released. The alpine meadows retained carbon better than the steppe areas, with most of the carbon sink happening in the meadows. Over time, the carbon absorption of the grasslands increased slightly, mainly due to rising temperatures and more precipitation. This information can help in planning conservation efforts for national parks in the region.