Man-made climate change is already cutting into oxygen levels in some parts of the world's oceans and could start producing new "dead zones" in some parts of the seas by 2030, US researchers warned this week.
Seawater has natural swings in the amount of oxygen it holds. But warming makes it harder for that water to absorb and distribute oxygen — and if carbon emissions continue on their current path, human-produced warming is likely to lead to falling oxygen concentrations across large areas of the oceans, scientists at the National Center for Atmospheric Research have found.

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