As we know the world population is increasing, so the user needs more and more energy. Meanwhile natural energy sources dwindling, especially fossil fuels. This makes our life more and more difficult so we must save. So what to do to save energy? First in our daily lives we use energy for cooking, heating and refrigeration for the house. We can save using solar energy on sunny days to replace fossil fuels. Besides, we can reuse the material used, saving water and electricity. 2nd, in the industry, the agriculture we can invent initiatives using wind power to run machinery. In summary, I think that today's scientists are increasingly concerned with the use of alternative energy
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