The condition of our planet today is, to say the least, a cause for great concern. As recently stated by Ms. Gro Harlem Brundtland, Prime Minister of Norway and Chairman of the World Commission on Environment and Development: “We are living in an historic transitional period in which awareness of the conflict between human activities and environmental constraints is literally exploding”. A decisive battle is now under way to preserve a truly endangered planet from the threat of extinction.
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Philippe Antoine (1992) studied this question.
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