Which of the following is true in regard to chemical fertilisers used in "Conventional agriculture"?

1. It enters the food supply and penetrates the water sources.
2. Although, expensive, but beneficial for the fertility of the soil.
3. It devastates the natural eco-system.

1 and 3

Conventional agriculture relies heavily on chemical fertilisers and toxic pesticides etc., which enter the food supply, penetrate the water sources, harm the livestock, deplete the soil and devastate natural eco-systems.