1Overfishing has caused a dramatic decline in tuna populations over the last fifty years.
2Is overfishing the main threat to marine biodiversity in the Pacific Ocean?
3The government has not yet introduced strict laws to prevent overfishing in coastal waters.
4If countries cooperated more effectively, they would reduce the impact of overfishing on global fish stocks.
5There are several international agreements that aim to control overfishing and protect endangered species.