50. The pollution caused by offshore oil development to the ocean is mainly manifested in the following: wastes generated during living, production and natural processes, and oily sewage is discharged into the ocean; accidents such as accidental oil spills, oil spills, blowouts, etc . ; the greatest harm to the ocean Biological effects: Oil films and oil blocks can stick to a large number of fish eggs and juveniles, cause fish eggs to die, deformity of juvenile fish, and also cause fish and shrimp to produce oily odor. Adult fish and shellfish live in long-term pollution In the seawater, some harmful substances are accumulated in the body, which will endanger human health when entering the market and consumed by humans. To prevent pollution from offshore oil development, we must start by stepping up technological innovation and raising the environmental awareness of offshore oil development workers. Which of the character this text does not mention about offshore oil development? ['Pollution status.', 'Environmental awareness.', 'Pollution performance.', 'Object of harm.']