Question

Which is the cleanest fuel?
1) coal
2) petroleum
3) natural gas
4) LPG
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Answer 1

Answer:

When natural gas is burned, it produces mostly carbon dioxide and water vapor -- the same substances emitted when humans exhale. Compared with some other fossil fuels, natural gas emits the least amount of carbon dioxide into the air when combusted -- making natural gas the cleanest burning fossil fuel of all.

Answer 2

Explanation:

4)LPG

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