To match feature ENVIRONMENT-LIGHTBULBS/

 
To match feature ENVIRONMENT-LIGHTBULBS/
A compact fluorescent light bulb which has mercury warning on it, is pictured in Great Falls March 28, 2007. Mercury is poisonous, but it's also a necessary part of most CFLs, the kind that environmentalists and some governments are pushing as a way to cut energy use. To prevent mercury from getting into landfills, the U.S. Environment Protection Agency, CFL makers and various organizations advocate recycling. To match feature ENVIRONMENT-LIGHTBULBS/ REUTERS/Hyungwon Kang (UNITED STATES)