[1] Boise State Univ, Human Environm Syst, Boise, ID USA
[2] Imperial Coll London, Ctr Environm Policy, London, England
[3] Max Planck Inst Evolutionary Anthropol, Dept Human Behav Ecol & Culture, Leipzig, Germany
[4] Govt Zanzibar, Dept Forestry Revolutionary, Wete, Tanzania
[5] Santa Fe Inst, Santa Fe, NM USA
[6] Univ Calif Davis, Dept Anthropol Evolutionary Wing, Evolutionary Wing, Davis, CA USA
[7] Univ Bristol, Dept Anthropol & Archaeol, Bristol, England
[8] Imperial Coll London, Ctr Environm Policy, 16-18 Princes Gardens, London SW7 1NE, England