07 Sep 2012:
LED Bulbs Widening Gap
In Energy Efficiency, Report Says
While today’s light-emitting diode (LED) bulbs are slightly better for the environment than compact fluorescent lamps, the energy efficiency gap will widen over the next five years
as the technology and manufacturing methods of LEDs improve, according to a new report. In an analysis of the impacts of the light technologies in 15 categories — including the energy and resources required to manufacture, operate, and dispose of the bulbs — researchers at the U.S. Department of Energy’s Pacific Northwest National Laboratory found that CFLs caused slightly more environmental harm than existing LED technologies in all but one of the areas studied. The one exception, they said, was hazardous waste generation because existing LEDs utilize a component, called a heat sink, which requires mining, refining, and processing of the aluminum. Improved efficiencies in emerging LED technologies, however, will reduce the amount of heat produced and, in turn, the size of heat sink required. As a result, they say, LED bulbs are expected by 2017 to have 50 percent less environmental impact than today’s bulbs and 70 percent less than existing CFLs. According to the lab’s analysis, consumers using either existing LED or CFL bulbs will reduce their environmental impact by three to 10 times compared with less-efficient incandescent light bulbs.
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A look at how acidifying oceans could threaten the Dungeness crab, one of the most valuable fisheries on the U.S. West Coast. Watch the video.
is now available for mobile devices at e360.yale.edu/mobile
An aerial view of why Europe’s per capita carbon emissions are less than 50 percent of those in the U.S. View the photos.
An indigenous tribe’s deadly fight to save its ancestral land in the Amazon rainforest from logging. Learn more.
video series looks at the staggering amount of food wasted in the U.S. – a problem with major human and environmental costs. Watch the video.
Residents of the Chocó Rainforest in Ecuador are choosing to plant cacao over logging in an effort to slow deforestation.
Watch the video.
Tribal people and ranchers join together to stop a project that would haul coal across their Montana land. Watch the video.