Our Choking Oceans

uyuyu
At several points in the earth’s past the oceans have given up their oxygen and borne witness to massive die-offs of marine creatures--extinction-level events--that forever changed the composition of marine life. These episodes of oxygen depletion seem to have been caused by molten magma being released into the seas, which belched massive quantities of iron into the ocean, prompting iron-loving algae to bloom in huge fields and robbing the seas of oxygen. Or, these eruptions sent carbon dioxide into the air, beginning a greenhouse effect that warmed seawater, reducing its ability to hold oxygen. Either way, when the ocean loses oxygen on a wide scale, it is very bad. And now, it’s happening again. Last week, an article in the journal Science showed that since about 1950, the zones of the world’s oceans that have lower-than-normal oxygen concentrations have increased dramatically in size. Big sections of the seas have such...
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The world's oceans are in even worse shape than we thought

heron0
The Great Barrier Reef is in rough shape after multiple bleaching events. The Ocean Agency / XL Catlin Seaview Survey Two new studies show that the world's oceans are in dire straits — even more than scientists previously thought. One study found that coral bleaching events, which can kill reefs, are now happening every few years instead of every few decades. And a new review found that oceans are losing oxygen faster than we realized, which could have serious consequences for marine life. Ocean health has a huge impact on human health, so solving these problems is essential. Our world is an ocean planet. The seas support hundreds of millions of people by providing food and jobs around the globe. Ocean plants produce up to 85% of the oxygen in the air we breathe. But a pair of new studies published in the journal Science indicate that the oceans have...
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