The earth has been through some major changes!
Animals we wish still existed: http://youtu.be/wutj5z1lElU
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Further Reading–
Overviews:
http://listverse.com/2012/03/09/top-10-mass-extinctions/
http://www.nature.com/nature/journal/v471/n7336/full/nature09678.html
Ordovician:
Role of CO2 levels:
http://www.sciencedirect.com/science/article/pii/S003101821000115X
http://geology.gsapubs.org/content/37/10/951.abstract
http://www.skepticalscience.com/CO2-was-higher-in-late-Ordovician.htm
http://www.newscientist.com/article/dn18618-highcarbon-ice-age-mystery-solved.html#.VK1lhmTF98s
Devonian:
http://en.wikipedia.org/wiki/Late_Devonian_extinction
http://www.devoniantimes.org/opportunity/massExtinction.html
http://www.nhm.ac.uk/nature-online/life/dinosaurs-other-extinct-creatures/mass-extinctions/late-devonian-mass-extinction/index.html
Permian
Good overviews:
http://science.nationalgeographic.com/science/prehistoric-world/permian-extinction/
http://www.businessinsider.com/volcanic-eruptions-caused-permian-extinction-2014-12
Size of lava fields:
http://en.wikipedia.org/wiki/Siberian_Traps
Effect of volcanoes;
http://articles.latimes.com/2005/jan/21/science/sci-extinct21
http://www.livescience.com/41909-new-clues-permian-mass-extinction.html
Recovery:
Triassic
http://www.nhm.ac.uk/nature-online/life/dinosaurs-other-extinct-creatures/mass-extinctions/end-triassic-mass-extinction/index.html
http://earth.columbia.edu/articles/view/3070
http://www.wired.com/2011/07/mass-extinction-methane/
Cretaceous:
http://www.nhm.ac.uk/nature-online/life/dinosaurs-other-extinct-creatures/mass-extinctions/end-cretaceous-mass-extinction/index.html
http://www.space.com/19681-dinosaur-killing-asteroid-chicxulub-crater.html
6th mass extinction:
http://www.businessinsider.com/earths-sixth-mass-extinction-is-already-happening-2014-7
http://www.independent.co.uk/environment/animal-extinction–the-greatest-threat-to-mankind-
397939.html
By the numbers:
http://www.sciencemag.org/content/345/6195/401
Extinction rates:
http://www.nature.com/nature/journal/v471/n7336/full/nature09678.html
http://onlinelibrary.wiley.com/doi/10.1111/cobi.12380/abstract
