I use plastic bags, then re-use them at home, usually as a mini bin-bag. If I didn't use them, my rubbish would still be in a different bin bag. I don't see what it gains to not use a carrier bag.
> no corner of the world seems to be without drifting clouds of them these days
Really? I hardly see any. I do see loads of takeaway cartons and dog mess, but no carrier bags. Should these problems be addressed first?
Maybe if the problem is that bad then, like the Australian cigarette packs, carrier bags should be covered with warnings and pictures of their effects, rather than the logos of the supermarkets.