I hate the things and don't like the way they float about jamming up marine equipment and other problems they cause, but are they really that bad?
paper bags are really far, far worse.
Obviously reusable bags sidesteps the whole issue.
By making a fuss over plastic bags, retailers are diverting people from the real environmental impact of their products.
For example,a kilogram of beef has about the same CO2 footprint as 1200 plastic bags.