There is some interesting information in this article. For instance, plastic bottles make up 12% of the waste found in the oceans. The biggest culprit? Food wrappers/containers.
And, cigarette butts are the number one item collected.
A report published last year suggested that up to 95% of the plastic in the world's oceans travelled via one of 10 rivers - The Yangtze, the Indus, the Yellow River, the Hai River, the Nile, the Ganges, the Pearl River, the Amur River, the Niger, and the Mekong.
More @ What plastic objects cause the most waste in the sea?