The marine ecosystem provides many resources that humans rely on for food, medicine, and construction materials. However, pollution from industrial and household chemicals and waste like plastic are threatening the health of the marine ecosystem. Chemical pollution can alter the normal functions of organisms and reduce their ability to reproduce. Plastic waste in particular kills many marine animals if ingested. To restore the marine ecosystem, humans must limit overusing resources and work to keep the balance between living and nonliving things in the ocean. Simple individual actions like using natural cleaners, reusable bags, and biodegradable plastics can help protect the marine environment.