Pollution is less due to oraganic agriculture as compare to intensiiculture
Answers
Because
1) Use of chemical fertilizers : when these chemicals drain into rivers, the river water gets polluted. The growth of algae and other plants on the river bed use up oxygen leaving insufficient oxygen for the fish life. This water is supplied to cities.Toxic elements in water affects human health and livestock.
2) Pesticides: Pesticides has weakened the human immune system.Because pesticides remain in crop which is eaten.This causes disease like gastro-intestinal infection,tuberculosis etc.
3) Removal of vegetation: Removal of vegetation for making farming areas, whether tress or smaller plants, can increase risk of soil erosion.
4) Irrigation: Effects of irrigation are not always positive, nearly half of the cultivated land is affected by waterlogging and salinity.