The Sixth Extinction: An Unnatural History

A very well-written introduction to the subject of extinction, how the concept developed and was eventually accepted by scientists. Very good examples of how we are in the midst (geologically speaking) of a sixth great extinction brought on by the spread and movement of humans to every part of the globe (and our penchant for bringing together elements from one specific environment into another) and climate change. The examples are frightening in clearly demonstrating how quickly the extinctions are happening.