Carbon Calculator Methodology

Tree Canada’s carbon calculator uses conservative estimates. Emissions factors are national or provincial averages. Tree Canada used the following sources to ensure calculations are not underestimated:

Energy Use

Energy use emissions factors were referenced from:

• National Inventory Report (1990-2011) Greenhouse Gas Sources and Sinks in Canada, Ministry of Environment and Climate Change Canada (ECCC), publications.gc.ca/collections/collection_2013/ec/En81-4-2011-2-eng.pdf

Air Transport

Flight emission factors were referenced from:

• 2010 Guidelines to Defra/DECC’s GHG Conversion Factors for Company Reporting DEFRA, www.defra.gov.uk/environment/economy/business-efficiency/reporting/

Road Transport

Vehicle emissions factors were referenced from:

• National Inventory Report (1990-2011) Greenhouse Gas Sources and Sinks in Canada, Ministry of Environment and Climate Change Canada (ECCC), publications.gc.ca/collections/collection_2013/ec/En81-4-2011-2-eng.pdf
• Fuel consumption ratings by model year, Natural Resources Canada, www.nrcan.gc.ca/energy/efficiency/11938

Other Transport

Other transport emissions factors were referenced from:

• 2010 Guidelines to Defra / DECC’s GHG Conversion Factors for Company Reporting DEFRA, www.defra.gov.uk/environment/economy/business-efficiency/reporting/
• National Inventory Report (1990-2011) Greenhouse Gas Sources and Sinks in Canada, Ministry of Environment and Climate Change Canada (ECCC), publications.gc.ca/collections/collection_2013/ec/En81-4-2011-2-eng.pdf