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In recent years, thoughtful people from all walks of life have become increasingly concerned with preserving and protecting our natural environment.  There was a time when such concern was expressed by only a few scientists; and they, for the most part, were regarded as radicals and alarmists.   The rest of us seemed to think this earth was so expansive and so enduring that we could abuse it forever without  noticeable consequence.  Now, we are being forced to change our thinking.  The years of neglect have started to take their toll, and it is becoming increasingly clear that environmental pollution is […]