"humankind, though "apt to forget it, is a creature of the earth. 'Dust thou art' and 'All flesh is grass' were not said by scientists, but they are sound biology." When lower creatures exhaust their resources, Vogt argued, bad things happen. Exactly the same is true for Homo sapiens. The article tallied example after example of overreaching, most drawn from Vogt's travels in Latin America. But then, provocatively, he switched to the United States' current enemy, Japan: "Many explanations have been offered for Japanese aggression," he argued. But, he asked, "can anyone deny that population pressures set off the explosion?" Unless humankind controlled its appetites for procreation and consumption, Vogt said, "there can be no peace."