There really is no reason not to have a tax on plastic bags. Sales taxes are somewhat regressive, but that’s easily solved by handing out canvas bags to poor people. Maybe two canvas bags twice a year to anyone that gets food stamps? There’s fucking plastic bags all over every city and highway in the United States and it does not need to be that way. In my personal experience, it just doesn’t occur to most people that paper or plastic is unnecessary. Also, it's actually a lot easier to carry groceries in the stronger canvas bags.
The Irish taxed each bag at 15 cents and they were using 90% less bags in three months. Now that is some effective taxation, my friends. Seattle is considering doing this in November. I hope they pass it.