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Can any energy source be pollution free ...

Can any energy source be pollution free ? Why or why not?

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No energy source can be pollution free. It is considered that solar cells are pollution free. However, even thelr making causes environmental damage indirectly. In the case of nucear energy, there is no waste produced after the fusion reactions. However, it is not totally pollution free. To start the fusion reaction, approximately 107 K temperature is required. which is provided by fission reactions. The wastes released from fission reactions are very hazardous. Hence, no energy source is pollution free.
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