Which of the following statements are true in the context of climate change and global warming?

1.An increase in sea level due to melting of glaciers and polar ice would indicate a warming in the average global temperature

2.The smog that occurred in London in December 1952 was called 'sulphurous' smog

3.Mauna Loa in Hawaii, USA has been famous for continuous monitoring of atmospheric CO2 levels since 1957

A1 and 2

B2 and 3

C1, 2 and 3 ✓ Correct

D1 and 3

Correct answer: (C) 1, 2 and 3

Explanation

Statement 1 is correct, as rising seas from melting glaciers and polar ice do signal a warming of average global temperature.

Statement 2 is correct, since the deadly London episode of December 1952 was a sulphurous smog driven by coal burning.

Statement 3 is correct, as Mauna Loa in Hawaii has continuously recorded atmospheric carbon dioxide since the late 1950s.

The Mauna Loa record is the source of the well-known Keeling Curve showing steadily rising carbon dioxide.

All three statements therefore hold true.

The 1952 Great Smog of London led directly to the Clean Air Act of 1956.

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