(Mustafa Ozer/AFP/Getty Images)
Higher temperatures are not the only mark global warming is leaving on the ocean. Carbon dioxide levels also are rising, causing the water's pH levels to drop. For many sea creatures, this is a bad thing, as the acidity is causing their shells to dissolve or form more softly in some cases.
Starfish, however, seem to be bucking this trend. Scientists have found that higher levels of carbon dioxide allow some species of starfish to thrive.
Some scientists worry, however, that starfish may not benefit from warming in the long run, as the animals that they rely on for sustenance may be negatively affected and thus the starfish could be left with fewer food options.