1. AAMA (American Automobile Manufacturers Association): 1998, ‘World Motor Vehicles Data.’ Washington DC.
2. Bousquet, P., Peylin, P., Ciais, P., Corinne, L.Q., Friedlingstein, P. and Tans, P.P.: 2000, ‘Regional Changes in Carbon Dioxide Fluxes of Land and Oceans Since 1980,’ Science 290, 1342–1346.
3. Blench, R.: 2000, ‘You Can't Go Home Again,’ Extensive Pastoral Livestock Systems: Issues and Options for the Future, ODI/FAO Report, London, UK.
4. Burns, T. J., Edward, L. K., David, A. M. and Dixie, A. M.: 1994 ‘Demography, Development and Deforestation in a World-System Perspective,’ International Journal of Comparative Sociology 13, 465–488.
5. CAST: 2003, ‘Agriculture's Response to Global Climate Change,’ Ames, Iowa, Council for Agricultural Science and Technology, USA.