With humanity's tentacles extending so fast, only a certain percentage of land can be kept forever in its pristine natural condition. In particular, nature preserves and national parks find themselves besieged by demands for development.
但以今天人類觸角延伸之快，能夠永遠保存的自然範圍，只能有一固定比例，尤其自然保護區、國家公園，常常在開發要求下，與其他利益發生衝突。