The references I used were:

• E.C. 2006 National Inventory Report 1990-2004 Greenhouse Gas Source and Sinks in Canada. The Canadian Government's Submission to the UN Framework Convention on Climate Change. URL:www.ec.gc.ca/ghg-geo.
• IPCC: Intergovernmental Panel on Climate Change. 2006 IPCC Guideline for National GHG Inventories.
• http://www.canadiandriver.com/articles/gw/01suv.htm