Chinese beachgoers walk by an algae-covered public beach in Qingdao, China, in July. The seas off China have been hit by their largest-ever growth of algae, ocean officials say, with waves of green growth washing onto the shores.
Credit AFP/Getty Images
A 2011 satellite photo shows algae blooms swirling on Lake Erie. Experts are expecting another large bloom this year on the lake.
Algae blooms are green or red or brown, slimy, smelly and you don't want it coming soon to a waterfront near you.
Most of us don't give a lot of thought to algae until the furry-like monstrosity is spreading over beaches, rivers, lakes and bays, but gigantic algae blooms have become an increasing problem around the world.
The danger algae blooms pose is that they sap the body of water where they are growing of nutrients and oxygen; they then die, decompose and rot.