In 1970, sections of Lake Erie were declared dead due to an excess of toxic algal blooms created by industrial pollution. But a little over a decade later, the lake went through a transformation that saw a return of wildlife and recreation to the area.
Over the past five years, the blooms have returned. These blooms are largely caused by fertilizer and farmland waste nearby running off into Lake Erie.
The video linked above discusses the past and current threats posed to Lake Erie by these blooms, and what scientists and conservationists are doing to stop them.
See the complete story on QUEST Ohio.