Oxygen levels, necessary for fish, are up and dangerous phosphorus levels are down in the historically polluted waterway. But a new report points to climate change as a possible wildcard.
(Image credit: Justin Tallis/AFP via Getty Images)
Oxygen levels, necessary for fish, are up and dangerous phosphorus levels are down in the historically polluted waterway. But a new report points to climate change as a possible wildcard.
(Image credit: Justin Tallis/AFP via Getty Images)
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