Peter Bridgewater1,2, Didier Babin3,4. 1. Institute of Applied Ecology, University of Canberra, Canberra, ACT 2601, Australia; peter.bridgewater@canberra.edu.au. 2. Division of Ecological Sciences, United Nations Educational, Scientific and Cultural Organization, 75007 Paris, France. 3. Agricultural Research for Development, French Agricultural Research Centre for International Development, 75116 Paris, France. 4. International Co-ordinating Council of the Man and the Biosphere Programme, United Nations Educational, Scientific and Cultural Organization, 75007 Paris, France.