00724cam a2200193 a 4500020001500000040000800015082002600023245002700049260014000076300002500216500004400241650001900285650002900304650002500333650002400358710007400382710004200456710003200498  a2831700744  cDLC00a304 IUC 1991 C149 Or.00aCaring for the earth :  aGland, Switzerland :bIUCN--the World Conservation Union :bUnited Nations Environment Programme :bWorld Wide Fund for Nature,cc1991.  aiv, 228 p. ;c27 cm.  aAccompanied by: Summary. 24 p. ; 27 cm. 0aHuman ecology. 0aSustainable development. 0aNature conservation. 0aSustainable living.2 aInternational Union for Conservation of Nature and Natural Resources.2 aUnited Nations Environment Programme.2 aWorld Wide Fund for Nature.