Caring for the earth : a strategy for sustainable living. United Nations Environment Programme. International Union for Conservation of Nature and Natural Resources. World Wide Fund for Nature. Human ecology. Sustainable development. Nature conservation. GF41 .C36 1991 333.72 CAR Accompanied by: Summary. 24 p. ; 27 cm. Includes bibliographical references (p. 213-222). Gland, Switzerland : IUCN--the World Conservation Union : United Nations Environment Programme : World Wide Fund for Nature, c1991. c1991. 1991 Text iv, 228 p. ; eng