The morally least defensible but politically most cogent reason is the utilitarian one: that species are too valuable to be allowed to become extinct.
(that species; to become; extinct) (that species; are; too valuable to be allowed to become extinct) Context(that species are,List([88, 104))):(The morally least defensible but politically most cogent reason; is; the utilitarian one)
that species are,List([88, 104))
that species that species The morally least defensible but politically most cogent reason
to become are is
extinct
too valuable to be allowed to become extinct
the utilitarian one