Question

A natural phenomenon that becomes harmful due to pollution is _____________.

• A. Global warming
• B. Ecological balance
• C. Greenhouse effect
• D. Desertification

Answer 1

Answer: (C)

Greenhouse effect

Solar radiation is absorbed in the Earth's surface and emitted as thermal energy that can be re-absorbed by greenhouse gases. Greenhouse gases include water vapor, carbon dioxide, ozone, and methane; the major components of atmospheric gas nitrogen, oxygen, and argon are transparent to infrared radiation. The greenhouse effect insulates the earth's surface, making it hospitable to life; however, human activities have increased the concentration of these gases, causing global warming.

So, the correct answer is 'Greenhouse effect'.