Marine life under threat from plummeting oxygen levels

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The loss of oxygen from the ocean due to climate change risks “dire effects” on sea life, fisheries and coastal communities, a global conservation body said Saturday. | AFP

Oceans are expected on current trends to lose 3.0-4.0 percent of their oxygen globally by 2100.

“With this report, the scale of damage climate change is wreaking upon the ocean comes into stark focus,” said IUCN acting director Grethel Aguilar.The largest peer-reviewed study to date on ocean oxygen loss concluded that deoxygenation is already altering the balance of marine life to the detriment of species that need more of the life-giving gas.

But loss of oxygen is affecting species across the food chain. The biomes that support around a fifth of the world’s current fish catch are formed by ocean currents that bring oxygen-poor water into coastlines.“Impacts here will ultimately ripple out and affect hundreds of millions of people,” the IUCN said.

“To stop the worrying expansion of oxygen-poor areas, we need to decisively curb greenhouse gas emissions as well as nutrient pollution from agriculture and other sources.”

 

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