"... While sharks kill an average of four humans a year, humans kill 100 million sharks each year. ... While recreational fishing is doing considerable harm to the shark population around the world, commercial fishing is decimating it. Sharks are harvested throughout the world for their meat, skin, fins, liver, and cartilage. ... Specifically sharks are killed as a by-product of the $40 billion tuna industry, which provides the United States with enough tuna to feed every American 2.6 pounds per year."