Pesticides
Pesticides are used to kill certain parasites such as insects or weeds which could keep the crop safe and well but the effects of pesticides to other areas have negative effect. When irrigating crops pesticides are washed off and make their way to a nearby river which then could cause harm and decrease populations of its inhabitants that is they need to be disposed of properly. Plus their role in the green revolution is protect crops while they are ready to be plucked out.
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