I know that algae reduces carbon dioxide in the atmosphere & makes more oxygen than trees. I am aware that there are some species that are allergic to algae and will die in it, but as an overall whole how good/bad would it be if we just let algae take over the Great Lakes.
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It would be bad. Algae blooms are followed by massive algae die-off as they use up all their nutrients. As the dead algae sinks to the bottom, it’s broken down mostly by bacteria which use oxygen and produce carbon dioxide. The massive amounts of food available to these bacteria causes their population to explode, quickly using up all the oxygen in deeper water levels where it replenishes very slowly, causing all other aerobic (oxygen using) deep life to die
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