Which of the following statements are true?

1.Carbon dioxide and methane are similar in per-molecule contribution to global warming

2.Burning fossil fuels at high temperatures is the main source of nitrogen, sulphur and carbon oxides

3.Petrol is mainly responsible for the release of lead into the environment

A1 and 2

B2 and 3 ✓ Correct

C1 and 3

D1, 2 and 3

Correct answer: (B) 2 and 3

Explanation

The true set is Statement 2 and Statement 3, covering the fossil-fuel origin of oxide pollutants and petrol as the lead source.

Statement 1 is wrong: per molecule methane traps far more heat than carbon dioxide, making the two anything but equal contributors.

Statement 2 is right: high-temperature fossil-fuel combustion is the chief source of nitrogen, sulphur and carbon oxides.

Statement 3 is right: leaded petrol was the main path by which lead was released into the environment.

Methane's global warming potential runs many times that of carbon dioxide over a century.

Phasing out leaded petrol sharply cut airborne lead in most countries.

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