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By Vanda Villanyi

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New Scientist, 193(2597), pg. 26-27, Mar. 2007. Energy Information Agency (2007). Fuel and Energy Source Codes and Emission Coefficients. S. html Environment Canada (2003a). Province-Territory Weather Winners for 70 Categories: Most heating degree days. Government of Canada, Ottawa, ON [Online]. html Environment Canada (2003b). Province-Territory Weather Winners for 70 Categories: Most cooling degree days. html Impact of Conversion to Compact Fluorescent Lighting, and other Energy Efficient Devices, on Greenhouse Gas Emissions 39 Environment Canada (2005).

Impact of Conversion to Compact Fluorescent Lighting, and other Energy Efficient Devices, on Greenhouse Gas Emissions 29 To assess the difference in GHG emissions involved in using ILBs and CFLBs, GHG intensities (in the form of g CO2 eq/kWh) for each life-cycle phase are multiplied by corresponding fabrication, space heating, space cooling, household lighting and disposal energy requirements to estimate total GHG emissions using the following formula: = + + + (11) + where ηi = GHG intensity as a function of the main energy source (g CO2 eq/kWh).

But the marginal decrease differed for each province. For example, the decrease in Ontario was much smaller than in Alberta, even though Ontario has nearly four times the population. Meanwhile, some provinces experienced a switch in the opposite direction to that experienced by the majority of the provinces. British Columbia, Manitoba, Quebec, and Newfoundland-Labrador all experience a net increase in GHG emissions resulting from the light bulb switch. Alberta is an example of a compelling case for making a switch from ILBs to CFLBs.

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