1. Batterham, R.J., 2004. Sustainability—Presidential IChemE Address, Rugby, UK. January 2004. Institution of Chemical Engineers, 〈http://www.icheme.org〉
2. Bureau of Rural Sciences, 2002. Science for decision makers—sustainability indicators—measuring our progress by Dr Jean Chesson, September 2002.
3. Carbon Sequestration, Technology Roadmap and program Plan’. March 12, 2003, U.S. DOE Office of Fossil Energy, National Energy Tecnhology Laboratory, 〈www.climatevision.gov/sectors/electricpower/pdfs/carbonsequestration_roadmap.pdf〉
4. Clean Coal Technology Roadmap, Department of Energy, The Electric Power Research Institute and the Coal Utilization Research Council, 〈www.netl.doe.gov/coal/CCPI/pubs/CCT-Roadmap.pdf〉 accessed on 30-10-04.
5. Copper Technology Roadmap, AMIRA International, 2004. 〈www.amira.com.au/documents/copperrm/public.htm〉 accessed 30-10-04.