The 6 Craziest Extinctions Ever

The earth has been through some major changes!
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Further Reading--

Overviews:

http://listverse.com/2012/03/09/top-1...

http://www.nature.com/nature/journal/...

Ordovician:

Role of CO2 levels:

http://www.sciencedirect.com/science/...

http://geology.gsapubs.org/content/37...

http://www.skepticalscience.com/CO2-w...

http://www.newscientist.com/article/d...

Devonian:

http://en.wikipedia.org/wiki/Late_Dev...

http://www.devoniantimes.org/opportun...

http://www.nhm.ac.uk/nature-online/li...

Permian

Good overviews:

http://science.nationalgeographic.com...

http://www.businessinsider.com/volcan...

Size of lava fields:

http://en.wikipedia.org/wiki/Siberian...

Effect of volcanoes;

http://articles.latimes.com/2005/jan/...

http://www.livescience.com/41909-new-...

Recovery:

http://scitechdaily.com/earth-recover...

Triassic

http://www.nhm.ac.uk/nature-online/li...

http://earth.columbia.edu/articles/vi...

http://www.wired.com/2011/07/mass-ext...

Cretaceous:

http://www.nhm.ac.uk/nature-online/li...

http://www.space.com/19681-dinosaur-k...

6th mass extinction:

http://www.businessinsider.com/earths...

http://www.independent.co.uk/environm...

397939.html

By the numbers:

http://www.sciencemag.org/content/345...

Extinction rates:

http://www.nature.com/nature/journal/...

http://onlinelibrary.wiley.com/doi/10...