Most striking of all is humanity's ever-expanding sphere of activity: We clear forests, drain marshes, and upset the ecological balance of nature, forcing wild animals and microorganisms to flee from their once well-hidden habitats into the open. In the struggle for survival, they inevitably encroach on humanity's territory.
首先最明顯的，是人類活動版圖的不斷擴增，開發森林、填平沼澤、獵捕奇珍異獸，破壞了自然的生態平衡，逼得原本密藏其中的野生動物和微生物群四處亂竄，為求活命而不得不侵犯人類。