|Column I||Column II|
|(i) Phosphate fertilisers in water||(a)||BOD level of water increases|
|(ii) Methane in air||(b)||Acid rain|
|(iii) Synthetic detergents in water||(c)||Global warming|
|(iv) Nitrogen oxides in air||(d)||Eutrophication|
(i - a, d), (ii - c), (iii - a), (iv - b)
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