These Hercules Sustain Plant Based Kitchen Tidy Bags have been independently tested and certified by the Usda Biobased program to contain minimum 60% plastic made from ethanol derived from fast growing sugar cane. This has the double benefit of helping to reduce our reliance on fossil fuels and helping to remove CO² from the atmosphere during the rapid growth phase of the sugar cane. Hercules Sustain Plant Based Kitchen Tidy Bags perform as well as regular kitchen tidy or garbage bags with these added benefits to the environment.