What factors affect HABs?

Nutrients, such as nitrogen and phosphorus, can contribute to blooms. Sources of nutrients include agricultural activities, application of lawn fertilizers, wastewater treatment facilities, septic tanks, sewer overflows, and runoff. Warm surface water temperatures can also contribute to blooms.

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1. What effects do HABs have on people and wildlife?
2. What factors affect HABs?
3. Do HABs occur in the Great Lakes?
4. What can I do about HABs?