Useful references:

1. Sustainable Energy Development Office website at:
   www1.sedo.energy.wa.gov.au/
2. Australian Greenhouse Office website at:
   www.greenhouse.gov.au
3. Research Institute of Sustainable Energy at:
   www.rise.org.au/info/Tech/waste/index.html
4. Australian Gas Light Company website at:
   www.agl.com.au
5. The United States Energy Information Administration website at:
   www.eia.doe.gov
6. The United States Environmental Protection Agency at:
   www.epa.gov
7. “Wikipedia – The Free Encyclopedia” website about “Internal combustion engines” at:
   en.wikipedia.org/wiki/Internal_combustion_engine