Bright green and red algal blooms on the surface of waterways appear to burst with life. But these microbial coatings are creating dead zones in the water below by depleting oxygen and blocking ...

Algae grow normally in the United States’ coastal waters … but when the growth gets out of control, it is called a harmful algal “bloom” (or HAB). This type of overgrowth releases excess chemicals ...

They say climate change is a major factor in the heightened risk. Marine biologists say a toxic algal bloom has been occurring off the coast of California more often than before, killing sea lions ...