"London: Scientists looking at different types of bags and their impact on the environment have found that cotton bags offered by many supermarkets may be less "green" than plastic carriers."
That's usually the case with pushy environmental initiatives. At least the eco-friendly bags invariably come with a message you can parade around with, like "I'm saving the planet". One woman in our complex has a car with a bumper sticker on it that says, "The owner of this car has purchased carbon offsets". Who is she kidding?! But they really, really want others to know, don't they?