http://e360.yale.edu/content/feature.msp?id=2250 08 Mar 2010: Report
World’s Pall of Black Carbon Can Be Eased With New Stoves
Two billion people worldwide do their cooking on open fires, producing sooty pollution that shortens millions of lives and exacerbates global warming. If widely adopted, a new generation of inexpensive, durable cook stoves could go a long way toward alleviating this problem.
by jon r. luoma
With a single, concerted initiative, says Lakshman Guruswami, the world could save millions of people in poor nations from respiratory ailments and early death, while dealing a big blow to global warming — and all at a surprisingly small cost.
“If we could supply cheap, clean-burning cook stoves to the large portion of the world that burns biomass,” says Guruswami, a Sri Lankan-born professor of international law at the University of Colorado, “we could address a significant international public health problem, and at the same stroke cut a major source of warming.”
Sooty, indoor air pollution from open wood or other biomass fires has long been linked to health problems and deaths. More recently, scientists have been surprised to learn that black carbon — not only from biomass fires but from dirty diesel engines and other sources — is a far larger contributor to global warming than previously suspected: The dark particles absorb and retain heat close to the Earth’s surface that might otherwise be reflected.
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Envirofit, a nonprofit started by two engineering graduates of Colorado State University and two professors, has developed a modified, patent-pending Rocket stove that it claims is exceptionally durable. A problem with past designs is that metal combustion chambers tend to quickly fail due to high heat and caustic fumes. But Envirofit worked with Oak Ridge National Laboratory scientists to develop a combustion chamber made of metal alloys that give it an exceptionally long life — long enough, it says, that it can issue warranties on the chamber for five years.
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