Currently, most of the world's electricity is generated by burning fossil fuels, such as coal, oil and gas. However, these fuels, when burned, produce toxic emissions that decrease our air quality and may cause global warming as well. Solar energy is an excellent alternative energy source, since it is waste-free and uses the readily available energy of the sun.
There are two primary solar-harvesting technologies: Photovoltaic (PV) and Concentrating Solar Thermal (CST). PV solar cells generate energy by converting solar energy directly into an electrical charge. Solar thermal technology, on the other hand, generates energy indirectly; the heat is concentrated to produce steam, and the steam then powers a generator that puts out electricity.
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