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Global warming - class-VIII

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Multiple Choice

Which of the following are the correct approaches to reduce global warming ?
(i)   Use of fossil fuels 
(ii)   Improving efficiency of energy usage 
(iii)  Afforestation
(iv)  Increasing growth of human population

  1. (i) and (ii)
  2. (ii) and (iii)
  3. (iii) and (iv)
  4. (i), (ii) and (iii)
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