The author of “Blue Whales” said human pollution is the biggest threat to Blue Whales. Oils spills can pollute large areas of the ocean and hurt sea animals, but plastic can hurt or damage animals as much as oil spills. Thousands of straws are thrown away each day and may end up in the ocean of lakes. plastic bags are also very dangerous to sea animals too. Some plastic can break down into fibers. most fibers stay in the lake or ocean because it is very hard to get out since they are so small. most fish eat the fibers and can damage or kill the fish.