SOLAR ENERGY

Most of the energy we consume comes directly or indirectly from the sun.In 1972, man consumed 90 trillion horsepower hours of energy.During the same year,the sun emitted 1.5 million trillion horsepower hours of sunlight on the planet.Only a small franction of this natural force is converted by green plants into all the food and wood that grows on the earth.Over hundreds of thousands of years this vegetation is eventually converted into fossil fuels like coal and oil.Because of the length of time which is required to produce fossil fuels,it woould be more feasible to employ solar energy can be used to stretch our limited supplies of fosil fuels.Experiments have already shown that we can heat a house,heat water,air condition buldings,cook food, and produce electricity with solar energy.Scientists have even converted an automobile to run on batteries which are charged by solar cells.In future, solar energy may be one of our main sources of energy.