The report looks at how changes in agricultural land use can affect soil productivity and the environment. It shows that land shifting between different uses is less productive and more sensitive to environmental issues like erosion and nutrient runoff. Programs like crop insurance subsidies and the Conservation Reserve Program can have bigger environmental impacts than expected, even if they don't affect production as much. Overall, lands moving between different agricultural uses are more vulnerable to erosion and nutrient runoff compared to other cultivated lands.