1. Sewage and Garbage
  2. Automobile Laxity
  3. Herbicide and Insecticide
  4. Industrial Tributaries
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1 Answers

Answer: Option 1

Environmental pollution is currently the biggest challenge facing the word today. Due to increase in population worid wide the untreated sewage discharge in lakes & rivers has increased. Even the garbage has increased manifold on daily basis. This was assessed during World Water Week by United Nation Environment Programme.

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