Do you need a bag?

Every year, shoppers around the world take home between 500 and 1000 billion plastic bags. What happens to them next? Plastic packaging is taking up more and more space on our planet, invading not only landfills but also the ocean.
Who is ready to eat a store bag for lunch? Why does convenient polyethylene take so long to decompose? How can we protect the planet from the polyethylene invasion?
For the average school age.