Multiple choice

Greenhouse effect is mainly caused by which of the following?

  1. CFCs

  2. CH4

  3. CO2

  4. CO

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A greenhouse gas is a gas in the atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The main greenhouse gas is carbon dioxide.