1. Andrew Murray is a doctoral candidate in the Department of Geography at the University of North Carolina-Chapel Hill, North Carolina, USA and a Geographer at the United States Environmental Protection Agency, Office of Research and Development, Cincinnati, Ohio, USA.
2. Alexander Hall is a Geographer at the United States Environmental Protection Agency, Office of Research and Development, Cincinnati, Ohio, USA.
3. Dr. Fran Kremer is a Senior Scientist at the United States Environmental Protection Agency, Cincinnati, Ohio, USA.
4. Dr. Diego Riveros-Iregui is the Bowman and Gordon Gray Distinguished Professor in the Department of Geography at the University of North Carolina-Chapel Hill, North Carolina, USA.