Solar Cookers use the light of the sun to cook food by using reflectors to heat an enclosed area that is not unlike an oven. There are dozens of different, simple to build, designs that may be used even in the winter! Save on bills and resources, cook sustainably when you can with the power of the sun!

There are dozens of plans to build your own Solar Cookers at SolarCooking.org, we’ve even included a really simple Science Experiment for The Kids!

Solar Cooking! Food Preparation with The Sun! - Exposing The Truth

In the mid 1700s, Horace de Saussure created the earliest known solar cooker, most comparable to what we now call a solar box cooker. He nested five glass boxes one inside the other, and rested them on a black slab of wood. After several hours exposed to sunlight, the temperature inside the box reached just shy of 190 degrees Fahrenheit (88 degrees Celsius). He used the box to bake fruit.
http://science.howstuffworks.com/environmental/green-science/solar-cooking.htm

Sun Oven is a Solar Cooker Oven that you may purchase from their website, this amazing solar oven may reach temperatures of up to 400 degrees Fahrenheit.
Sun Oven

“This is a review of a new type solar cooker I purchased, called the “Hot Pot.” It is different than box solar cookers, and I was curious if it would cook effectively, particularly in an emergency situation. I figured, if it worked well, I would be able to cook as long as there was sun, and save using other types of non-renewable fuels.”
DirtTime.com

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The Solar Cookers World Network is an alliance of nearly 500 non-governmental organizations (NGOs), manufacturers, and individuals actively promoting solar cooking in over 100 countries. This wiki-based site allows Network participants to share information and collaborate on projects and research. Solar cooking is an important part of Integrated Cooking, which includes the use of fuel-efficient woodstoves and heat-retention cookers.
Solar Cookers World Network

Solar Cooking! Food Preparation with The Sun! - Exposing The Truth
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Solar Cookers on facebook, Heroes Series: DIY Solar Cooker.