Solar energy
Anyone who has ever watched a pot of water boiling "just" by the sun is sure to have been impressed. The principle behind solar cooking is as fascinating as it is simple: sun rays are converted to heat and conducted into the pot. Solar cooking does not require any other fuel such as wood, paraffin, gas or coal. High-quality solar cookers reach temperatures over 200ºC. This temperature is more than sufficient to cook all your food, bake bread and also to heat up an iron for ironing your clothes.
Many areas do not have electricity yet and where electricity is available, many people don't cook with it, because of the high cost. Other fuels such as paraffin and gas are expensive and the worlds poorest people (earn less than 2$ per day) spend between 40% - 60% of their income on fossil fuels, Fuels such as paraffin, gas, coal and electricity are expensive and non - renewable meaning supplies will eventually run out further endangering future generations chance of a sustainable lifestyle. Solar energy can save households and society at large time and money by creating more tax money to put into better projects.
