The causes of the Pleistocene extinctions - habitat destruction and hunting - should ring alarm bells for the present day, as these are the two major factors still threatening global biodiversity, this time as a result of wilful human activity.
(these; are; the two major factors still threatening global biodiversity) (the two major factors; threatening; global biodiversity; T:still)
these the two major factors
are threatening
the two major factors still threatening global biodiversity
global biodiversity T:still