Book shows life on Earth without humans

[img_assist|nid=5949|title=Click on photo to enlarge or download|desc=Alan Weisman, author of "The World Without Us." - Photo courtesy of Ronn Spencer|link=popup|align=left|width=134|height=200]The scenario: the whole of humanity disappears one day, leaving worldly possessions, buildings and trash behind.

What happens next is the subject of a new book, "The World Without Us," by Alan Weisman, a journalism professor at the University of Arizona and a science writer.