There are three (2017).
"...human overpopulation, overconsumption by the rich, and inequity (poverty)."
"There was essentially complete agreement that the drivers of the now-underway sixth mass extinction were human overpopulation, overconsumption by the rich, and inequity (poverty)."
from Vatican Visit: A note on the following workshop:
How to Save the Natural World on Which We Depend
PAS-PASS Workshop, Casina Pio IV, 27 February-1 March 2017
by Paul Ehrlich.