Vertebrates on the brink as indicators of biological annihilation and the sixth mass extinction
Gerardo Ceballos; Paul R. Ehrlich; Peter H. Raven. (2020). Vertebrates on the brink as indicators of biological annihilation and the sixth mass extinction. Proceedings of the National Academy of Sciences.
Original publication: https://doi.org/10.1073/pnas.1922686117
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