Nature just can’t keep up: It takes 300 to 400 years for plastic to completely decompose into its elements and return to the form harmless to humans and the environment. That’s why the challenge is extensive recycling – and not only the valuable plastics which are easy to recycle. The types which can’t simply be melted and reused are important. These hybrid types make up 65 percent of plastic waste. And they can simply be converted into their original state - oil.