Till a few years back, the smoke of factory chimneys produced choked smogs, which causes dangerous lung diseases in humans. To reduce this problem, tall chimneys were build, but these only moved the pollution higher in the sky and turned the clouds acidic. These clouds produced acidic rains, which caused much damages to the crops.
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chimneys produced❌provided✅
chimney were build❌built✅
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Till a few years back, the smoke of factory chimneys
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