How can people cook when there isn’t any sun?
They have to use combustible fuels. The percentage of time a solar oven can be used varies widely with factors like weather, skill of the cook, and the urgency of the need. (The GTZ conducted a solar cooking project in South Africa and concluded that solar cookers were used an overall average of 40% of the time. Solar cookers will never be THE solution. They are an important addition to the kitchens of the world.
