• Another agricultural trend of growing concern is the increased nutrient content of coastal waters resulting from fertilizer runoff in agricultural regions. Augmented by urban sewage discharge in some situations, this results in huge algal blooms, which, as they die and decay, deplete the oxygen content in the water, leading to the death of the fish.

    Lester R. Brown, Michael Renner (2014). “Vital Signs 1999-2000: The Environmental Trends That Are Shaping Our Future”, p.25, Routledge