I believe that Planet Earth and its living inhabitants are endangered by
the unrestrained activities and excesses of a single species, Homo
sapiens. The precarious status of Earth is a byproduct of human
biology. Aldo Leopold noted that human beings are ordinary members of
the biota—man has evolved by the same process that created all other
forms of life and therefore has the same fundamental needs. Mankind, by
happenstance and the evolutionary process, assumed a bipedal upright
stance, thereby gaining distant gaze and an expanded
horizon—advantageous in avoiding predators and seeking prey. Bipedal
gait proved to be an efficient locomotion, which has carried man to
virtually all parts of the planet. Freed from the ground, man’s upper
extremities became prehensile, allowing him to physically manipulate
the environment. In addition, the cranial end of man-the-organism
developed into a neural center emphasizing capabilities different than
those of other vertebrates—expanded cognition rather than, for example,
long-range navigation or physical agility.
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