Cetaceans have been extensively hunted for their meat, blubber and oil by both indigenous peoples and commercial operations. Although the International Whaling Commission has agreed on putting a halt to commercial whaling, some nations continue to do so. They also face environmental hazards such as underwater noise pollution, plastic buildup and ongoing climate change, but how much they were affected varies widely from species to species, from minimally in the case of the southern bottlenose whale to the baiji (or Chinese river dolphin) which is considered to be functionally extinct due to human activity.