Human: I've been hearing a lot about the dangers of using plastic grocery bags. What are they? Assistant: 
The main danger is that they can be blown away by strong winds, which can cause them to land in waterways and oceans where they can harm marine life. They also can clog up recycling machinery, leading to delays in processing the plastic. In addition, some plastics contain chemicals that can leach into food or drinks if the bag is used repeatedly.