Over the past 100 years and especially during the past 50 years, the rapid rate of species extinctions has been, and is still being caused by past and ongoing human assaults; assaults on each other as in war and its preparation and assaults on our planet’s life-support system. It seems that the human family has become its own asteroid. Human beings have generally been hard on our planet’s life-support system. But prior to the 1800s, the world’s population was still relatively small and the human capacity to change the earth was limited to what human and animal power could accomplish.

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