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Read "The Sixth Extinction by Elizabeth Kolbert: http://amzn.to/1xGKn0K
Rodolfo Dirzo et al. "Defaunation in the Anthropocene" http://bit.ly/1H7JQdw
Stuart Pimm et al. "Biodiversity of Species and Their Rates of Extinction" http://bit.ly/1A5UZJM
Get to know an endangered species: http://discover.iucnredlist.org/
Half of world's wildlife has died off in past 40 years: http://bit.ly/1BHl8jR
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