Educating people about the consequences of littering the beach with plastic is good, but generally has a limited effect. Dissuading people through laws and policing can help, but again isn't that effective. Providing people with incentives to recycle would seem to be a workable idea that does have evidence of success. The UK, for example, is currently introducing a deposit scheme, where people receive money when they return plastic bottles after use. The ideal solution, however, would be for all plastic products to be replaced with biodegradable alternatives.