Q. Consider the following statements regarding greenhouse gases/effect:
1.Greenhouse gases absorb long wave radiation from the earth and emit it again towards the earth.
2.Without greenhouse effect the average temperature at surface of Earth would have been more than 30 degrees Celsius.
Which of the statements given above is/are correct?

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: A
Notes:

Explanation: The greenhouse effect is a naturally occurring phenomenon that is responsible for heating of Earth’s surface and atmosphere.

You would be surprised to know that without greenhouse effect the average temperature at surface of Earth would have been a chilly –18oC rather than the present average of 15oC.

Source: NCERT – Environmental Issues