Cardboard solar oven wins first prize

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(Photo: Kyoto Energy)

Can a couple of cardboard boxes, black paint, tin foil, and an acrylic cover help solve major environmental and social problems? Forum for the Future certainly thinks it's possible.

The Kyoto Box, a surprisingly simple solar-powered cooker, won a $75,000 first prize in the sustainability group's climate competition.

Jon Bomer, the Kenya-based entrepreneur who invented the cooker, set out to transform the lives of villagers in developing world who use firewood to cook. What's more, the cooker costs about $6.60 to make, so it can actually benefit the people who need it most.

"We're saving lives and saving trees," he says in a press release. "I doubt if there is any other technology that can make so much impact for so little money."

Ironically, the Kyoto box uses the "greenhouse effect" to help the planet. An acrylic cover set atop two cardboard boxes (one inside of the other) traps the sun's energy. Black paint and silver foil help to concentrate the heat. A layer of newspaper or straw placed in between the two boxes provides insulation.

Here are just some of the ways this brilliant invention can make an impact:

  • Decreases carbon emissions created from burning firewood.
  • Slows down deforestation by curbing the need for firewood.
  • Removes indoor smoke pollution and the health problems associated with it.
  • Lowers the cost of energy since fuel from the sun is free.
  • Allows families to easily boil water so they can have access clean drinking water.
  • Eliminates the need for children to spend time looking for firewood so they can spend that time in school.

This just goes to show that sometimes less is more.

See how the Kyoto Box will work in Africa in this video:

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comments from our community

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  • Posted by Kryistina Wed Jun 24, 2009 12:47pm PDT
    Depending on the size of the inner box and the brightness of the sun, the interior of the box can maintain a temperature hot enough to properly cook a ham or turkey on a long summer day if put out in the morning. If, however, the inner box is truly large, it may be only capable of warming food. For a measly $4 or so more, you can add an oven thermometer and actually record the temperature yourself. I have recorded an even and steady temperature of 275 degrees for about three hours in a large inner box on a partly cloudy day. Smaller boxes and larger reflectors make for hotter temperatures. *smile*
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  • Posted by pan_kisst Tue Jun 30, 2009 3:50pm PDT
    We, in canada, can cook in one of these for about 3-4 months of summer. I have used a larger- wood, glass and aluminum one, to cook a meal here in manitoba in october. The food was fully cooked. this one can get to over 500 degress farenheit. We should all be using these to cook our food without using electricity. We would be re-using cardboard that would otherwise be garbage.
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  • Posted by scorpiochk420@sbcglobal.net Sun Sep 13, 2009 10:45am PDT
    how about all of you people stop putting so much of you energy into complaining about what this guy did or trying to say that you did this in high school... well if you did why didnt you have it developed and put it go some good use... my guess is that most of you spend you time complaining about others instead of trying to help others... every little bit helps and atleast he is bringing this idea (no matter who invented it) to light in an area that needs it. why dont you haters try to invent something to help other or the planet and follow through with it and get it implamented where it would be mosted needed and do it all for free. HATERS YOU JUST GOTTA HATE'M
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