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Plastic bag littering, and associated indiscriminate waste disposal and consumer behaviour;
Resource consumption issues, including reduction, reuse and recycling;
Plastic degradability issues relating to littering and resource use;
Social issues, community education and awareness, and consumer perceptions.^[1]

The following disadvantages have also been identified:

Plastic bags are made of petrochemicals which are not a renewable resource.
Plastic bags are flimsy and often do not stand up as well as paper or still cloth.
When littered or improperly disposed of, they are unsightly and can be a hazard to wildlife.
Most plastic bags do not readily decompose when littered nor in a sealed sanitary landfill.
Plastic bags can cause unsupervised infants to suffocate.

On a global scale, some areas of the sea surface are contaminated with more than 960,000 items of plastic per square kilometre. About one million seabirds choke or get tangled in plastic nets and other debris every year. And about 100,000 seals, sea lions, whales, dolphins, other marine mammals and sea turtles suffer the same fate. Source: The Wildlife Trusts, December 12 2007

About 13 billion single-use plastic bags are distributed each year in Britain: 10 per household each week. On average, we use each plastic bag for just 12 minutes, yet they take 500 to 1,000 years to break down. Then there is the climate-change aspect to think about: Plastic bags are manufactured using oil. Cutting their useage in Britain by a quarter would reduce CO2 emissions by as much as 63 tons a year – equivalent to taking 18,000 cars off the road. Source: The Wildlife Trusts, December 12 2007