Really? Lake Erie was declared a "dead lake" in the 60s due to eutrophication. It was bad enough that Dr. Seuss even called it out in a kids book, and you're saying that in 1973 (50 yrs ago) it was better than it is today?
"During the 1960s, Lake Erie was declared a “dead lake” due to eutrophication and pollution. The children’s book, The Lorax, written by Dr. Seuss, actually included the following line referring to fish: “They will walk on their fins and get woefully weary in search of some water that isn’t so smeary. I hear things are just as bad in Lake Erie.” Fortunately, as the conditions in Lake Erie improved, the line was removed from future editions of the book."
