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C. Refining Third World Indoor Cooking Stoves

Narrator: This is Science Today. Improved cooking stoves used in Third World countries have dramatically reduced the amount of indoor air pollution - a problem that has long plagued these populations. But better still, University of California, Berkeley researcher Dan Kammen, who helped develop, test and distribute these stoves in Kenya, Uganda and Central America, says these stoves only cost about a dollar each.

Kammen: These stoves look more like a little Coleman portable one, although they're not made of metal generally. The ones that have become incredibly popular in Kenya look a like a little hourglass. They're about a foot tall, the top part of the hourglass has a clay liner, the pot sits on top of that and the hourglass on the bottom is where the ash falls.

Narrator: It may sound simple, but Kammen says it took a lot of work to refine.

Kammen: In fact, my training as a physicist and doing a lot of the field work in energy and development issues, ended up with a lot of other researchers as well, being a relatively important part of the process. We needed to think through all kinds of design questions.

Narrator: Kammen recently initiated a relationship with the EPA to help distribute these pollution-reducing stoves in Third World countries. For Science Today, I'm Larissa Branin.