1. Center for the Environmental Implications of Nanotechnology, Duke University, Durham, North Carolina 27708, United States
2. Civil and Environmental Engineering Department, Duke University, Durham, North Carolina 27708, United States
3. Civil & Environmental Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
4. Environmental Science, Baylor University, Waco, Texas 76706, United States
5. Biology, Baylor University, Waco, Texas 76706, United States
6. Biology, Duke University, Durham, North Carolina 27708, United States
7. Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, United States
8. Energy and Environment Directorate Pacific Northwest National Laboratory Richland, Washington 99354, United States
9. Nicholas School of the Environment, Duke University, Durham, North Carolina 27708, United States
10. Plant and Soil Sciences, University of Kentucky, Lexington, Kentucky 40506, United States