Chemical fertilizers are useful to crops. In which way they cause environmental pollution? (AS1)

Fertilizers contaminate the soil with impurities, which come from the raw materials used for their manufacture.

Chemical fertilizer also contaminates the groundwater and this is the main issue as ground water is the primary source of water.

Too much use of chemical fertilizers led to eutrophication.

Chemical fertilizers contain harmful gases like carbon dioxide, nitrogen, ammonia which contribute to the release of greenhouse gases.