Question
What is global warming? On what does it depend?

Answer

  1. Global warming is increased temperature of the earth. During past century, the temperature of the
  2. Earth has increased by $0.6 ^\circ C,$ most of it during last three decades.
  3. This is mainly caused by greenhouse effect.
  4. Global warming depends upon the amount of $CO_2$ and other greenhouse gases present in the atmosphere.
  5. An increase in $CO_2$ concentration increases earth’s temperature by retaining more heat.
  6. Carbon dioxide increases temperature by about $50\%, CFCs$ increase it by $20\%$ and methane increases it by $15\%$ whereas other pollutants increase it by $10\%.$
  7. Atmospheric air pollution, industrialization and greenhouse effect cause global warming.

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