1. Institute of Arctic and Alpine Research, University of Colorado, Boulder CO 80309-0450, USA
2. School of Geography, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
3. Department of Archaeology and Prehistory, University of Sheffield, Sheffield S10 2TN, UK
4. Department of Anthropology, Hunter College, City University of New York, NY 10021, USA
5. Department of Sociology and Anthropology, Bucknell University, Lewisburg PA 17837, USA
6. 2 Clos Rhymni, Cwmrhydyceirw, Swansea SA6 6RB, UK
7. Department of Geography, University of Edinburgh, Edinburgh, EH8 9XB, UK