human
I've been hearing a lot about the dangers of using plastic grocery bags. What are they?
assistant
Plastic grocery bags are made from a synthetic material called polyethylene. They are used to carry groceries and other items, and can be reused many times before they need to be thrown away. The problem is that they can take hundreds of years to break down in landfills, and they release toxic chemicals into the environment when they degrade. This can cause problems for wildlife and people who live near landfills.