Putting plastic in the ocean needs to stop — sea animals are dying because of it. More than a million seabirds and 100,000 sea animals die every year. Plastic does not decompose on land — what makes anyone think it should in water?
It would help this problem to tax or not supply plastic bags in stores, or having a plastic return or "reward." That would make the Earth cleaner, because some people would want money and go around picking up and returning the plastic so it could be disposed of properly.
In the oceans, there are miles and miles of plastic just killing animals. Animals do not know what's good and bad for them. If they see the plastic, they often try to eat it and it gets stuck in their bodies and they die.
There are so many ways to stop this problem. Having a tax on bags would help, as would a "no plastic day" when no one uses any plastic that will hurt their environment. Even the small things will help.