Humpbacks have been heavily exploited in the past but are now recovering in most areas. Commercial whaling in the early 20th century reduced the global Humpback population by an estimated 90%. The species was on the brink of extinction in 1966 when a general moratorium on the hunting of Humpbacks was introduced which is still in force today. It is estimated there are currently 30,000-40,000 Humpback whales worldwide. Federal laws protect Humpbacks, however their habitat is under great pressure from over-fishing and pollution.