인류의 조상들이 사냥을 하던 시절에는 짐승들을 잡아 먹으며 여러 세대를 걸쳐 그들이 어떤 영향을 미치는지 몰랐을 겁니다.
Now one should think this problem affected people certainly when in predatory societies, they killed animals and they didn't know they had done so after a few generations.