If you look at the world's oceans today, you'll spot a bunch of garbage -- like that enormous trash turd in the Pacific -- and, worse, alarmingly fewer fish than there were just a few decades ago. In fact, not even half as many fish are floating around there today, just another sign us humans are great at ruining everything.
Specifically, the World Wildlife Fund's recent "Living Blue Planet Report" suggests there are now only half the fish in the world's oceans compared 1970, according to a report by Grubstreet. Researchers examined 5,829 populations of more than 1,200 species of fish and other marine animals, and found that some had declined by some 49% in the period between 1970 and 2012. Worse yet, some fish species -- tunas, mackerel, and bonitos -- have declined by almost 75%, and diminishing numbers of popular sushi fish like bluefin and yellowfin tunas are of "particular concern," according to the WWF. But what is behind this dramatic drop in ocean life? Take a wild guess.