A very bright yound student has successfully completed his first round of experiments looking for microbes and proper environmental conditions that will decompose of plastic bags in 3 months time rather than 1000 years time. The results are VERY promising.
16 Year Old Student Finds Way to Decompose Plastic Bags in 3 Months

16 Year Old Student Finds Way to Decompose Plastic Bags in 3 Months
(via news.therecord.com)
Submitted by jquipp on Tue, 2008-05-27 13:54. | Tags: technology | Bags | decompose | landfill | plastic
Interview with the Student
Interview with the student at MotherJones.com - http://www.motherjones.com/blue_marble_blog/archives/2008/05/8363_science_fair_wh.html