The mouth of a humpback whale emerges while swimming in the Nuup Kangerlua Fjord near Nuuk in southwestern Greenland, Tuesday, Aug. 1, 2017. Algae that cling to the underside of sea ice are losing their habitat. If they vanish, the impact will be felt all the way up the food chain. Copepods, a type of zooplankton that eats algae, will lose its source of food. The tiny crustaceans in turn are prey for fish, birds and whales. (Source: AP Photo/David Goldman)