Paper 1 · People, Development and Environment
Which of the following causes the least pollution when burnt?
APetrol
BDiesel
CCoal
DNatural gas ✓ Correct
Correct answer: (D) Natural gas — Natural gas causes the least pollution when burnt, so that is the answer.
Explanation
★Natural gas causes the least pollution when burnt, so that is the answer.
★Natural gas is the cleanest-burning of these fuels.
★It gives off far less soot, sulphur and other pollutants than the others.
★So burning natural gas causes the least pollution.
★Petrol, diesel and coal release more harmful emissions.
★So the answer is natural gas.
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