Today, our planet greatly depends on many energy resources. The population of the world is rising, which means that people will need more energy for living, but much of the energy that people use is being depleted. To be more specific, coal, natural gas, oil and nuclear energy are some of the main energy sources used today. Even though our energy demands depend highly on these sources, use of these energy sources is associated with various environmental problems and a concern for the future with an inevitable shortage.
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