The fuel causing the least pollution

Options :
  1. Natural gas
  2. coal
  3. diesel
  4. petrol
Answer and Explanation :-

Answer: Option 1

Explanation:

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A sailor chooses the wind that takes the ship from a safe port. Ah, yes, but once you're abroad, as you have seen, winds have a mind of their own. Be careful, Charlotte, careful of the wind you choose.
-Avi The True Confessions of Charlotte Doyle