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Are we trading energy conservation for toxic air emissions?
Date:10/1/2008

A team of Yale scientists has found that certain countries and some U.S. states stand to benefit from the use of compact fluorescent lighting more than others in the fight against global warming. Some places may even produce more mercury emissions by switching from incandescent light bulbs to compact fluorescent lighting.

The study, which appears online October 1 in the journal Environmental Science and Technology, looked at all 50 states and 130 countries to determine the impact of fluorescent lighting on total mercury emissions in those regions.

Estonia, which relies heavily on coal-powered energy generation, tops the list as the country that would see the greatest reduction in mercury emissions for every incandescent bulb it replaces with a compact fluorescent light bulb (CFL). However, given its similar reliance on coal-fired plants, coupled with its huge population, China stands to reduce its mercury emissions by the greatest overall amount. Other countries near the top of the list include Romania, Bulgaria and Greece; within the U.S., North Dakota, New Mexico and West Virginia have the greatest potential to reduce their mercury emissions.

But much of South America, Africa, the Middle East and parts of Europe, along with Alaska, California, Oregon, Idaho and several New England states, would actually increase their mercury emissions by making the switch from incandescent to fluorescent lighting. The results depend on a complex relationship between a number of factors, including how dependent a region is on coal-powered energy generation, the chemical makeup of the coal used in those plants, and existing recycling programs for CFLs.

"Compact fluorescent lighting is an area where we're really pushing this alternative and all these policies are being enacted, but we're not looking at the potential unintended consequences of what we're doing," said study author Julie Beth Zimmerman, an assistant professor in Yale's D
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Contact: Suzanne Taylor Muzzin
suzanne.taylormuzzin@yale.edu
203-432-8555
Yale University
Source:Eurekalert

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