Asked in PPSC, FPSC and other one-paper exams (compiled from unofficial resources).

Environment, Weather & EcologyGreenhouse Effect and Global Warming

Which of the following is considered the least polluting fuel?

A.Coal
B.Diesel
C.Natural gasCorrect answer
D.Petrol

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Quick fact: Natural gas is considered the least polluting fuel among conventional fossil fuels because it burns more cleanly and produces fewer harmful emissions.

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