Gerardo Ceballos, Paul R. Ehrlich e Rodolfo Dirzo, Biological annihilation via the ongoing sixth mass extinction signaled by vertebrate population losses and declines, in PNAS, vol. 114, n. 30, 23 maggio 2017, pp. E6089–E6096, DOI:10.1073/pnas.1704949114, PMC 5544311, PMID 28696295.
«Much less frequently mentioned are, however, the ultimate drivers of those immediate causes of biotic destruction, namely, human overpopulation and continued population growth, and overconsumption, especially by the rich. These drivers, all of which trace to the fiction that perpetual growth can occur on a finite planet, are themselves increasing rapidly.»
