Lighting Up the Future
The concerns over mercury have not resulted in any significant dimming of support for CFLs.
The governments of Canada and Australia recently announced plans to phase out the sale of incandescent bulbs by 2012, and similar "ban the bulb" efforts are taking place in countries around the world.
In March a coalition of environmental groups joined Philips Lighting, the world's largest lighting manufacturer, in a new initiative aimed at transitioning the U.S. to CFLs by 2016.
Philips has announced plans to discontinue marketing incandescents in the U.S. and Europe by that date, and major retailers such as Wal-Mart have plans for greatly increasing their sale of CFLs.
The switch is occurring because CFLs are proven cost and energy-savers. Traditional incandescent bulbs are highly inefficient—about 90 percent of the energy they consume produces heat rather than illumination.
A compact fluorescent bulb can produce the same amount of light for less than quarter of the energy and last eight to ten times as long. A switch to CFLs would save an average household about 50 U.S. dollars a year in electricity bills, according to government estimates.
Because of these benefits, CFLs are widely seen as an "easy" first step for nations seeking to reduce global warming. The burning of coal for electrical power is a major source of atmospheric carbon dioxide, which is now widely believed to be changing the earth's climate (see interactive overview of climate change).
According to a recent report by the Washington, D.C.-based Earth Policy Institute, a worldwide shift to CFLs would permit the closing of more than 270 coal-fired power plants. Switching to CFLs in the U.S. alone could save the energy output of 80 plants.
For environmentalists, the clincher is that by requiring less energy, CFLs will actually cut down on mercury pollution produced by coal burning, and EPA agrees.
"By using less electricity, CFLs help reduce mercury emissions from coal-burning power plants, which are the largest source of human-caused mercury emissions in the United States," said agency press officer Ernest Jones. (Related: "Clean Coal? New Technology Buries Greenhouse Emissions" [May 2, 2006].)
Reuse, Recycle—And Don't Vacuum
While their mercury doesn't make CFLs unsafe, experts say, it does place them alongside many other household products—from paint to batteries—that need to be used and disposed of in a responsible manner.
Michael Bender directs the Vermont-based Mercury Policy Project, an organization dedicated to reducing mercury pollution worldwide. He said up to 95 percent of the mercury contained in CFLs can be recovered if the bulbs are recycled properly.
"The best option for managing a spent CFL is to recycle it. Short of that, the next best option is to safely store the lamp until an opportunity for recycling becomes available," Bender said.
But many consumers don't know where to recycle the light bulbs—or remain oblivious to the need for special disposal in the first place.
Recycling opportunities, however, should soon be increasing as CFLs become established as mainstream household lighting. Retailers such as Ikea have store-based collection centers for used bulbs, and a similar program is being developed by Home Depot in Canada.
"Recycling programs are already in place in many areas," noted mercury clean-up expert Hogue. "Community leaders don't need to reinvent the wheel."
If recycling is not possible, used CFLs should be sealed inside a plastic bag and taken to a household hazardous waste disposal site, just as should batteries, oil-based paint, and motor oil, EPA recommends.
And if a CFL does shatter on the floor, the greatest danger may be the broken glass.
But to minimize exposure to mercury vapor, EPA and other experts advise a few precautions.
Children and pets should stay away from the area, the agency says, and windows should be opened for at least 15 minutes so that vapors may disperse. Cleanup can be done by hand using disposable materials, the expersts add.
"Use rubber disposable gloves and scoop up the materials with stiff paper or cardboard," Bender said. "Use sticky tape to pick up small pieces and powder, clean the area with a damp paper towel, and dispose of the materials in an outside trash can."
"Never use a vacuum," Hogue added. This, he said, will only disperse the mercury vapor and leave particles trapped inside the cleaner bag.
Free Email News Updates
Sign up for our Inside National Geographic newsletter. Every two weeks we'll send you our top stories and pictures (see sample).
SOURCES AND RELATED WEB SITES