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| List-$I$ | List-$II$ |
| $(A)$ Phosphate fertilizers in water | $(1)$ Increases $BOD$ value of water |
| $(B)$ Methane in air | $(2)$ Acid rain |
| $(C)$ Synthetic detergents in water | $(3)$ Global warming |
| $(D)$ Nitrogen oxides in air | $(4)$ Eutrophication |
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