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Envirofit’s Clean Cookstove, for use in the developing world, cuts deadly smoke and carbon-monoxide emissions by 80 percent.

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The stove’s precisely measured opening lets in the right amount of air for efficient burning. Because of that, it needs only half as much fuel as ordinary stoves or fires.

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It can be purchased inexpensively in hundreds of villages in India.

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The stove can burn traditional biomass fuels, such as the wood and coconut shells shown here.

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The Clean Cookstove is meant to replace traditional open fires, such as those above, which burn fuel incompletely–producing dangerous indoor air pollution.

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Developed by Envirofit.org in collaboration with engineers at Colorado State University, the Clean Cookstove was tested in labs to ensure that it reduced emissions.

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Other models, such as this two-burner stove, are on the way.