books.google.com - What would alien visitors in the far future, piecing together the history of earth, find of our brief reign? What clues will we leave? What fossils? Just as we have gained knowledge of the past, of ancient climates and the activities of creatures long dead, so too might they decode the rocks. The Earth...http://books.google.com/books/about/The_Earth_After_Us_What_legacy_will_huma.html?id=MGv9JmuVaTcC&utm_source=gb-gplus-shareThe Earth After Us: What legacy will humans leave in the rocks?