The first thing I should point out is that the dozen or so cars that had been pushed down the ravine into the woodland stream have been removed since I took these shots in 2006. Many of them were 1970s' models and had perhaps spent more than twenty years surreptitiously polluting the water with oils, acids and particulates as it flowed into the River Tawe.
Small plants and trees grew through them and around them all the same. Little by little they were disintegrating and dissolving back into their surroundings, but I was a little alarmed by the reaction of one teenager I showed the pictures to who said his schoolteacher had told him that pollution helps animals evolve. He had probably misunderstood the teacher's words, though I do wonder which bit.