1. Department of Recreation, Sport and Tourism, University of Illinois at Urbana-Champaign, Champaign, IL, USA
2. Department of Forest Resources and Environmental Conservation, Virginia Tech, Blacksburg, VA, USA
3. Center for Leadership in Global Sustainability, Arlington, VA, USA
4. Graduate School of Education and Woods Institute for the Environment, Stanford University, Stanford, CA, USA
5. Center for Research and Evaluation, COSI, Columbus, OH, USA