Plastic wrap tangles around sorting equipment at recycling facilities, shutting down operations as employees try to cut it out of the equipment. Huge bales of paper shipped overseas can contain as much as 30 percent plastic waste. “Contamination is one of the biggest challenges facing the recycling industry,” the EPA said in a statement to Grist. It takes time and money to haul, sort through, and dispose of all this unwanted refuse, which makes recycling more of a burden for city budgets. Many cities have ended up cutting costs by working with private waste companies; some don’t even bother trying at all. About a quarter of Americans lack access to any recycling services.

The difficulty of recycling plastic can make the chasing-arrows symbol near meaningless, with environmental groups calling plastic recycling a “false solution.” Only around 5 percent of plastic waste in the United States gets shredded or melted down so that it can be used again. Much of the rest flows into landfills or gets incinerated, breaking down into tiny particles that can travel for thousands of miles and lodge themselves in your lungs.