If we disappeared...

What would happen to the Earth if mankind suddenly disappeared? According to the Times Online (http://www.timesonline.co.uk/article/0,,3-2399972.html), within hours, nature would begin to eradicate its impact. In 50,000 years all that would remain would be archaeological traces. Only radioactive materials and a few man-made chemical contaminants would last longer - an invisible legacy. Check out the timeline image at http://www.treehugger.com/files/doom_1.php