All of us are aware of the changes to our lives and surroundings brought by growing numbers of people and by new and improved technologies. Many of these changes have brought opportunities undreamed of by past generations; for many of us our lives are healthier and longer than at any time in human history and we share unimaginable wealth and prosperity. Unfortunately not everyone shares in these benefits. The growth of human populations, the exploitation of resources, and new technologies have contributed to a growing gap between rich and poor. Pollution and environmental degradation affect all people and all parts of the planet. Wilderness and nature have retreated before the expansion of the human enterprise
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