Currently, most of our energy comes from fossil fuels (coal, oil and natural gas). However, reserves are limited. Because demand for electricity is growing very fast, fossil fuels will run out in a relatively short time. So, one has to develop and use alternative energy sources. An alternative energy source is nuclear energy. Nuclear energy could provide enough electricity for the needs of the world for hundreds of years, but it can be very dangerous. An alternative energy source is geothermal heat from deep within the earth. Scientists use heat to create energy. However, this power only in a few places in the world. The sun, water and wind as alternative energy sources. The wind turns the windmill and move sailboats. It is a clean energy source, and there are many. Unfortunately, if the wind does not blow, there is no wind. When water moves from a high place to a lower place, it makes energy. However people must build dams to use this energy source. Dam a lot of money, so the country is also expensive energy. The sun frees large amounts of energy every day. This energy can be transformed into electricity. Many countries use solar energy for their daily lives. Solar panels on the roof can generate enough energy for heating or cooling the entire house. Solar energy is not only rich and infinite, but clean and safe. Although there are some disadvantages, the potential of alternative energy sources is huge. However, how to be able to take full advantage of energy resources is a question for researchers worldwide.
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