Dear Student,Few Reasons are given below:.......1).Chemical pesticides can have far-reaching effects on human health. Theycan contaminate the quality of surface water and groundwater, as well as cause toxicity within most individuals who consume pesticide-sprayed fruits and vegetables. Since most farmers use these fertilizers on their farm, animals receive first-hand exposure to these toxins--thus causing people who ingest non-organic meat products to experience pesticide toxicity, too.....2)The biggest issue facing the use of chemical fertilizers is ground water contamination. Nitrogen fertilizers break down into nitrates and travel easily through the soil. Because it is water-soluble and can remain in groundwater for decades, the addition of more nitrogen over the years has an accumulative effect. ..3)Fertilizers are a mixture of toxic chemicals which are absorbed into the plants, leading toxins to enter the food chain via vegetables and cereals and water creating health affects increase and spread rapidly.......Regards........