What will remain of our plastic, cans, and other junk long after humans have vanished? What kind of fossils will we leave, as relics into the far future? A blizzard of new objects has suddenly appeared on Earth: plastic bottles, ballpoint pens, concrete flyways, outsize chicken bones, aluminium cans, teabags, mobile phones, T-shirts. They're produced for our comfort and pleasure--then quickly discarded. The number of our constructions...