Greater amounts of land were cleared than at any time before.
The average temperature at the Earth s surface has become 2℃ cooler.
The amount of carbon dioxide in the atmosphere has increased measurably.
The amount of farmland worldwide has doubled.
Some modern anthropologists hold that biological evolution has shaped not only human morphology but also human behavior. The role those anthropologists ascribe to evolution is not of dictating the details of human behavior but one of imposing constraints ways of feeling, thinking, and acting that come naturally in archetypal situations in any culture. Our frailties emotions and motives such as rage, fear, greed, gluttony, joy, lust, love may be a very mixed assortment, but they share at least one immediate quality: we are, as we say, in the grip of them. And thus they give us our sense of constraints.
Unhappily, some of those frailties our need for ever-increasing security among them are presently maladaptive. Yet beneath the overlay of cultural detail, they, too, are said to be biological in direction, and therefore as natural to us as are our appendixes. We would need to comprehend thoroughly their adaptive origins in order to understand how badly they guide us now. And we might then begin to resist their pressure.
24. The primary purpose of the passage is to present
a position on the foundations of human behavior and on what those foundations imply
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