Signs of Life?

Organisms' effects on terrain aren't all that easy to perceive

12:03pm, July 30, 2007

Imagine our planet unmarred by humans: no buildings, no highways, no farms, no dams, no open-pit mines. Now, imagine the world suddenly swept clean of all life whatsoever: no plants, no animals, not a single microbe. Would the newly vacant landscape retain unmistakable evidence that life had ever existed?

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