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Man - Survival
How much time does man have left? A few decades, scientist warns, unless bi
Man ignores survival needs, architect Ian L. McHarg says, Ames.
Which scientist do you believe?
Doctor (Dr.) B. Commoner fears man doomed in 30 years.
Doctor (Dr.) P.B. Sears, retired Yale University biologist, warns of man, p
If man is to survive.