Dead fish
ShutterstockWhat’s going on out there?

Climate change is scrambling the oceans. It’s raising water temperatures, lowering pH levels, reducing oxygen availability, and driving down the size of wildlife populations the oceans can sustain.

A study published Tuesday in the journal PLOS Biology painstakingly chronicles many of the consequences of marine changes that the researchers describe as “unprecedented” during the last 20 million years:

Our results suggest that the entire world’s ocean surface will be simultaneously impacted by varying intensities of ocean warming, acidification, oxygen depletion, or shortfalls in productivity. Only a very small fraction of the oceans, mostly in polar regions, will face the opposing effects of increases in oxygen or productivity, and almost nowhere will there be cooling or pH increase. …