The problem about plastics is the long half-life. Thrown plastics will stay in oceans for a very long time. I really like the idea and there has to be change in our environmental behaviour. There is research about natural substitutes for plastics. When thrown into the ocean it breaks up into their natural ingredients which even can be eaten by the marine life. Plastic is valuable and has to be utilised with care and responsibility for a sustainable future. Thanks for your personal initiative!