We’ve also wreaked havoc on the oceans, having brought industrial fishing to over half of their surface area. A third of fish stocks are being fished unsustainably, and 60 percent are being fished at the maximum level to qualify as sustainable. Since the 1870s, over half the world’s coral reefs have died, largely due to bleaching events worsened by warming oceans, agricultural runoff, and industrial pollution. Wetlands like marshes, swamps, and mangroves have been decimated since the 18th Century, primarily as a result of coastal development. And there are 400 known coastal “dead zones,” in which ultra-concentrated nutrients like nitrogen and phosphorus have caused intense algae blooms that suck up oxygen and make water uninhabitable for most marine organisms. These dead zones are the result of industrial fertilizer running off into the ocean.