1. Nicholas School of the Environment, Duke University, Durham, North Carolina 27708, United States
2. College of Geoscience and Survey Engineering, China University of Mining and Technology, Beijing 100083, China
3. Department of Geological and Environmental Sciences, Appalachian State University, Boone, North Carolina 28608, United States
4. The Polis Center, IU Luddy School of Informatics, Computing, and Engineering, Indiana University−Purdue University Indianapolis, Indianapolis, Indiana 46202, United States
5. State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University 100084 Beijing, China
6. Department of Geology, Panjab University, Chandigarh 160014, India