Q. Which one of the following is the primary impact of increasing greenhouse gas emissions on Earth’s upper atmosphere?
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[A] It increases atmospheric density in the upper atmosphere.

[B] It causes Earth upper atmosphere to cool and contract.

[C] It expands the mesosphere and thermosphere.

[D] It reduces the amount of infrared radiation reflected into space.

Answer: B
Notes:

Explanation – Increasing greenhouse gas emissions led to the cooling and contraction of Earth’s upper atmosphere (mesosphere and thermosphere). This occurs because incoming infrared radiation is reflected into space, reducing atmospheric density at higher altitudes.

Source: The Hindu

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