You mean like… burning it?
"Plastic shopping bags make a fine diesel fuel
Date:
February 12, 2014
Source:
University of Illinois at Urbana-Champaign
Summary:
Plastic shopping bags, an abundant source of litter on land and at sea, can be converted into diesel, natural gas and other useful petroleum products, researchers report. The conversion produces significantly more energy than it requires and results in transportation fuels – diesel, for example – that can be blended with existing ultra-low-sulfur diesels and biodiesels. "
Dislaimer: Nobody says that will not contribute to global greenhouse emissions.