Q34 (CDS-II/2017) Environment & Ecology › Climate Change & Global Initiatives › Climate science and impacts Answer Verified

Statement I : Global warming signifies the rise in global surface temperature. Statement I : The increase of concentration of greenhouse gases in the atmosphere causes the rise in global surface temperature.

Both the statements are individually true and Statement II is the correct explanation of Statement I

Both the statements are individually true but Statement II is not the correct explanation of Statement I

Statement I is true but Statement II is false

Statement I is false but Statement II is true

Result

Your answer: — · Correct: A

Explanation

Statement I is true as global warming refers to the long-term rise in the average temperature of the Earth's climate system, primarily reflected in global surface temperature increases [1]. Statement II is also true and provides the correct explanation for Statement I. Greenhouse gases (GHGs) such as carbon dioxide, methane, and nitrous oxide allow short-wave solar radiation to enter the atmosphere but trap long-wave infrared radiation escaping from the Earth's surface [2]. This process, known as the greenhouse effect, is a natural phenomenon that maintains habitable temperatures [4]. However, human activities have increased the concentration of these gases, intensifying the effect and trapping extra heat, which directly causes the observed rise in global surface temperatures [5]. Thus, the increase in GHG concentration is the causal mechanism behind global warming [6].

Sources

[1] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 7: Climate Change > 2. greenhouse gases > p. 9
[2] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 29: Environment Issues and Health Effects > Greenhouse gases (GHGS) > p. 426
[4] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 17: Climate Change > 17.2. GREENHOUSE EFFECT > p. 254
[5] Exploring Society:India and Beyond ,Social Science-Class VII . NCERT(Revised ed 2025) > Chapter 3: Climates of India > Fossil fuels: > p. 64
[3] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 7: Climate Change > 2. greenhouse gases > p. 11
[6] https://education.nationalgeographic.org/resource/greenhouse-effect/

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Statement I : Global warming signifies the rise in global surface temperature. Statement I : The increase of concentration of greenhouse gases in the atmosphere causes the rise in global surface temperature.

Explanation

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