keep the ocean clean

This is a well thought advertisement the title speaks out the truth of polluting ocean as “when we pollute the sea we pollute it for long time. The features in this advertisement are well maintained as in the fossil stone we can see the fossils of some plants and snail but the plastic is in-tact. We know that it takes very long time to form a fossil in a rock but as we can see that every thing in the picture turned into fossil but the polythene bag remained as it is. From this advertisement people can understand that if we are using more polythene and polluting the sea all the plastics we throw in the ocean is going to remain there in the ocean. The polythene garbage are going to pile up in ocean rather than being decomposed which is tried to describe by allowing the bigger portion of stone for the polythene bag.
The publisher's slogan is, "help us to keep our ocean clean" which have a pleading appeal and means they only cant make the ocean clean they need everybody's help to keep the ocean clean.