Question
  1. Name the two greenhouse gases.
  2. What is global warming?

Answer

  1. Carbon dioxide and methane are green house gases.
  2. Global warming when concentration of green house gases like $\text{CO}_2$ increases, these gases trap infrared radiations of sun and increase the temperature of the earth i.e. increase green house effect causing global warming. Global warming leads to abnormal changes in climate.

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