文件名称:chap09
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Renewable energy can be defined initially as any energy source that is derived directly or indirectly
solar energy. In the broadest sense, however, almost all of the energy we use today, including fossil
fuels, can be considered a form of solar energy. The most familiar forms of energy, such as wood, oil, gas,
and coal, are embodied forms of solar energy gathered, stored, and transformed by natural processes
solar energy. In the broadest sense, however, almost all of the energy we use today, including fossil
fuels, can be considered a form of solar energy. The most familiar forms of energy, such as wood, oil, gas,
and coal, are embodied forms of solar energy gathered, stored, and transformed by natural processes
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chap09.pdf