21.   Polluted water in the inland bays have sparked surface algae blooms that draw dissolved oxygen from deeper water.

22.   A harmful algae bloom occurs when naturally occurring toxic, microscopic algae suddenly reproduce in a large, dense mass in the ocean, upsetting the natural balance.

23.   Algae blooms also have been linked to a microbial called pfiesteria that has killed fish in tributaries of the Chesapeake Bay and off the Carolinas.

24.   Algae blooms were blamed for that incident.

25.   Algae blooms have been blamed for years for the so-called dead zone in the Gulf of Mexico along the Louisiana and Texas coast.

26.   Algae blooms can also cause it when single-cell plants die and sink to the ocean floor, consuming oxygen.

27.   And algae blooms may cause hypoxia, which is when single-cell plants die and sink to the ocean floor, consuming oxygen.

28.   Dead fish have washed up on the coast near Mogadishu, where the water is darker than normal, an indication of an algae bloom.

29.   Nutrients dumped into rivers and streams generate algae blooms that rob waters of oxygen, hurting plant and animal life.

30.   Ocean water was darker than normal where dead fish washed up near Mogadishu, the Somali capital, an indication of an algae bloom.