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Therefore, human causes of eutrophication include the use of agricultural fertilizers. Other causes include sewage and aquaculture, which is the growing or farming of fish, shellfish and aquatic plants. Wastewater from certain industries and burning fossil fuels can also contribute to eutrophication.
Hereâs what the cultural eutrophication process looks like: 1  Pollution enters the water, adding sediment, nitrogen, and phosphorus (the nutrients). 2  The added nutrients fuel algae growth; algae begin to reproduce in huge numbers, creating whatâs often called an algae bloom.