i read in the paper some kid devised a way to make plastic bags decompose much faster, meaning a few years, rather than over 100.
He got the process down to 3 months.
Burd concluded that a combination of two types of bacteria - Sphingomonas and Pseudomonas - was most effective at breaking down the polyethylene. After isolating these two bacteria, combining them with some sodium acetate and incubating the solution at 37 C, Burd was able to degrade the plastic by 43 per cent in six weeks. He figures the solution would entirely break down plastic bags in a matter of three months.
http://canadianpress.google.com/article/ALeqM5ikPF3RTfCeG-DqnxSCx6LpJAXmXA