Protected areas cover a sixth of Earth's land and freshwater

FILE - This Feb. 25, 2019 photo provided by the Galapagos National Park shows a hammerhead shark nursery which was recently discovered in Santa Cruz, Galapagos Islands, Ecuador. The International Union for the Conservation of Nature lists hammerhead sharks as endangered species that have suffered sharply declining numbers in recent years around the world. (Galapagos National Park Photo via AP, File)