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Table 1.1Anthropogenic and natural sources of greenhouse gases
| Anthropogenic sources | Natural sources | |
|---|---|---|
| Carbon dioxide | Fossil fuel combustion; deforestation; industrial processes. | Respiration by plants and animals; oceans; decay and fermentation of organic matter; forest and grass fires. |
| Methane | Livestock and rice cultivation; biomass burning; landfills; coal mining. | Wetlands. |
| Nitrous oxide | Fossil fuel combustion; wood combustion; nitrogenous fertilizers. | Anaerobic denitrification in soil and water. |
| Hydrofluorocarbons | Foam insulation; metal production; coolants in refrigerators and air conditioners. | ... |
| Perfluorocarbons | Aluminium production; refrigeration; air conditioning; semi-condutor manufacturing. | … |
| Sulphur hexafluoride | Magnesium smelting; aluminium production; electrical switchgear manufacture and failure. | ... |
Source(s):
Environment Canada, 2006, "Greenhouse Gases," Information on
Greenhouse Gases and Sinks, http://www.ec.gc.ca/pdb/ghg/about/gases_e.cfm (accessed March 11, 2008);
Environment Canada, Greenhouse Gas Emissions Reporting: Technical Guidance
on Reporting Greenhouse Gas Emissions, 2006 Reporting Year (2005 Emissions
Data), http://www.ghgreporting.gc.ca/GHGInfo/Pages/2006Guidance-English.pdf
(accessed March 13, 2008); Intergovernmental Panel on Climate
Change, 2001, “Technical Summary,” Climate Change 2001:
Working Group I: The Scientific Basis, http://www.ipcc.ch/ipccreports/tar/wg1/017.htm (accessed March 13, 2008).
