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Debating How Alarmist to Be About Climate Change through 2021
Endangered Species 2016 through 2019

biological annihilation from the sixth mass extinction      web

webhttp://www.pnas.org/content/early/2017/07/05/1704949114.abstract
authorGerardo Ceballos, Paul R. Ehrlich
publicationPNAS
date2017-05-23

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