Consider the following statements. Which of the above statements are correct? Choose the correct answer from the options given below:

1.Earth would be safer without the greenhouse effect

2.Major contribution to the greenhouse effect comes from carbon dioxide

3.Earth's climate was changing even before man appeared on earth

A1 and 2 only

B2 and 3 only ✓ Correct

C1 and 3 only

D1, 2 and 3

Correct answer: (B) 2 and 3 only

Explanation

Statements 2 and 3 are correct: carbon dioxide is the major contributor to the greenhouse effect, and Earth's climate was changing even before humans appeared.

Statement 2 is right because carbon dioxide is the leading long lived greenhouse gas driving the effect.

Statement 3 is right since natural cycles altered the climate across geological ages long before humanity.

Statement 1 is wrong because without the greenhouse effect the Earth would be far too cold for life, not safer.

The natural greenhouse effect keeps average surface temperatures suitable for living things.

The concern today is the extra warming from human emissions on top of this natural balance.

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