This is one of the most fascinating books I have ever read. Weisman describes what would happen to the world if we disappear. His accounts of how we have damaged our earth actually made me wish at one point that humans would disappear! Not necessarily seriously, but it really made me think of how even humans without technology and large, skyscraping cities have a large affect on the planet and animals. For a long time I really thought humans are the sole cause for the changes in our ecosystem, but these changes have been happening for millions of years. So while we might be speeding it up, the earth is just going through one of its regular changes and can always repair itself. Such a thought-provoking book!