We should keep the ocean clean simply because, we can not live without clean drinking water. Everything on this planet that is living requires water. If all the bodies of water were completely polluted then the plants would die, so then the animals would die because they wouldn't have any plants to eat, then we would die because we would not have any plants or animals to eat. It would be a domino effect yet again.We need to keep the ocean clean so we can keep living. Amen sistah!!