I think it is a absolute and utter shame what human beings are doing to the environment. The cause extinction of even one species is a travesty beyond comprehension but do we stop there, no.
As you can see below from the estimated stats we are losing literally 10's of thousands every year (3 per hour).
"Scientists are warning that by the end of this century, the planet could lose up to half its species, and that these extinctions will alter not only biological diversity but also the evolutionary processes itself. They state that human activities have brought our planet to the point of biotic crisis.
In 1993, Harvard biologist E.O. Wilson estimated that the planet is losing 30,000 species per year - around three species per hour. Some biologists have begun to feel that the biodiversity crisis dubbed the "Sixth Extinction" is even more severe, and more imminent, than Wilson had expected."
http://en.wikinews.org/wiki/Largest_mass_extinction_in_65_million_years:_scientists
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