Table 1.1Anthropogenic and natural sources of greenhouse gases

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Anthropogenic 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).
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