1. Department of Soil and Crop Sciences, Colorado State University, Fort Collins, Colorado, Department of Chemistry, Colorado State University, Fort Collins, Colorado, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Switzerland, Center for Applied Geoscience, University of Tübingen, Germany, School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia, Delaware Environmental Institute, University of Delaware, Newark, Delaware, Eawag, Swiss Federal Institute of...