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Coal has to be carefully burned to avoid releasing large amounts of waste gases, particularly sulfur compounds, that contribute to air pollution and acid rain. Oil is easier to burn cleanly, and natural gas is the least polluting of all fossil fuels.

There have been programs to produce cleaner solid, liquid, and gas fuels from coal, but few have been widely developed.

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7y ago
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Q: Why is coal not commonly used for energy?
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