"What's beneath your feet? Maybe a wooden floor or a stone one and, beneath that? Brick foundations, water pipes, power cables and who knows what else. Keep going down and you'll come to soil, rocks, and the raw stuff of Earth. We imagine these basic foundations of our planet to be a kind of pristine, internal wilderness. While we can see many of the changes we've made to the world, some of our impacts are virtually invisible, and land pollution is a good example. " (Quoted from article)