There is a street market near us that has a small square with a few trees in it. These trees are always full of shredded bags and because the cheapest available are blue, white or blue and white striped, the effect last winter was quite dramatic - as if the trees had been decorated tastefully for Christmas.

Of course, decorating trees with shredded plastic is never tasteful, but the visual image was quite stark and gave a good example of what these bags get up to when they're let loose into the world.

The leaves hide these bags in summer, but they'll still be there, in a couple of months time.

LTS