1. Institute for the Environment, University of North Carolina at Chapel HillChapel Hill North Carolina USA
2. Now at Department of Ecosystem Science and ManagementThe Pennsylvania State UniversityUniversity Park Pennsylvania USA
3. Department of Chemical, Biochemical and Environmental Engineering and Center for Urban Environmental Research and EducationUniversity of MarylandBaltimore County, Baltimore Maryland USA
4. Advanced Science Research Center at the Graduate Center of the City University of New York, and Department of Earth and Environmental Sciences, Brooklyn CollegeNew York New York USA
5. Department of GeographyUniversity of North Carolina at Chapel HillChapel Hill North Carolina USA
6. Now at Departments of Environmental Sciences and Civil and Environmental EngineeringUniversity of VirginiaCharlottesville Virginia USA