Our research focuses on understanding the biogeochemical cycles governing the fate and behavior of chemicals in the environment and, ultimately, the composition of our soils, atmosphere, and water. We are quantifying how changes in climate, land use, and agricultural management practices affect the cycling of carbon, nutrients, contaminants, and water at local, regional, and global scales. We are addressing such questions as: How can we continue to intensify crop production to meet a growing global demand for food and fiber while preserving the quality of soil, water, and air? How do we grow biofuel crops while maintaining food security and freshwater resources, and minimizing carbon and nitrogen losses from the landscape? How do different land uses and cropping systems affect the net flux of greenhouse gases and the storage or loss of carbon, nitrogen, and phosphorus from soils?