This is bad for a number of reasons. First the dies, ink, and glue all get absorbed into the water. The water flows into our rivers, our drinking water, other animals homes and the ocean. Many many animals are dieing due to the chemicals in the water. Second, plastics do not disintigrate very easily.
Many animals eat lots of plastic and starve to death.
The plastic fills up their stomach but can not be disolved, and the animal doesn't eat regular food. It becomes malnourished, or starves until it dies. The thing that we do not realize is that we, just you and just me can start a change. You are an example where ever you go. When you go out make sure that you never litter.