So a guy goes down to Mexico, starts collecting plastic bottles for cash and something occurs to him: why not build an island out of plastic bottles? It only takes him 3 years, but he does it. Plants are able to grow on it. So he has a ton of plastic bottles, slung together in fish nets, holding up his own personal floating island. Well, nevermind the implications for structural integrity of something built on plastic in salt water, what about the implications for the health of the ocean? I'll be (horrified and) interested to see how he deals with the decomp. Hope the environmental reality sinks in before his island does.
A Citizen's Guide to Plastics in the Ocean: More Than a Litter Problem