I'm probably just another Know-It-All High School Biology teacher here, but.....

The #1 cause of abnormal algae blooms is nutrient inbalance and the #1 cause of nutrient imbalance is the inorganic fertilizers we use.

It all runs off of your lawn/crops sooner or later and it all winds up in the rivers....where it causes that green slimy s*@t we all hate.

Cause and Effect
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Sometimes it's better to think about everything you say......
than to say everything you think about