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Climate change causing more dead zones in oceans, lakes and rivers | CBC News
A duck swims in Lake Michigan's Green Bay near an accumulation of algae. The bay is one of the many bodies of water that have developed dead zones, areas where fertilizer and wastewater runoff has created excessive levels of nutrients that build up microbes but deprive marine life of oxygen. A new study has found that global warming is a making the problem of dead zones worse.