Why is using plastic bags a problem?

Approximately one million new plastic bags are consumed every minute worldwide. Per year uses one person 300 plastic bags and the average life span is about 12 minutes.
Estonians will buy about 700 million a year, a total of nearly 7000 tons of plastic bags, of which only a fraction of the re-use.
The average life span of plastic bags for humans can be measured in minutes; however, their decomposition can take 40 human generations. As plastic bags decompose, they emit toxins that could eventually deprive human kind of that 40th generation…
Plastic bags are responsible for the death of nearly one million wild birds and animals a year after they swallow plastic bag residues.
Plastic bags also comes into coastal waters, where they are hazardous to aquatic communities. Plastic bag does not decay in water, but it will broken down into small pieces. Fragments absorb chemicals from the sea, which feed on fish, and then it comes back to our table.