Microorganisms have produced dramatic shifts in the composition of the Earth’s atmosphere, and they continue to drive significant exchange of trace gases and aerosols between the land, oceans, and atmosphere. Many microbe-mediated processes have a leading-order impact on climate variability, are themselves susceptible to climate change (potential for feedbacks), and are poorly understood (e.g., CH4, N2O, biological particles). In terrestrial ecosystems, soil microorganisms provide benefits to society (ecosystem services such as nutrient cycling), which depend strongly on land use (urban, rural, agricultural, natural) and land surface type. The Meredith lab focuses on improving the process-based understanding of the environmental and biological drivers of microbe-mediated trace gas fluxes using an interdisciplinary set of laboratory and observational methods. Linking gene to function for microbe-mediated gas fluxes Determining key controls on ecosystem trace gas fluxes Majors: majors with biological, ecosystem, or environmental focus