The plastic bags you bring home from the supermarket probably end up in a landfill. Every year, more than 500 billion plastic bags are distributed, and less than 3% of those bags are recycled.
They didn't compose in soil. If they are burnt harmful gas and dangerous oxidation takes place. Increasing air pollution.
Using paper bags are a good choice because they don't pollute. We can see plastic is everywhere around us. So, we should minimize it's use.