Before Nature Dies

19th century acclimatization Africa agricultural animals aquatic areas Australia biological birds bison blue whales cattle caused chemical coast Congo conservation continent countries cultivated deer deforestation degradation destroyed destruction dieldrin disappeared domestic East ecological ecological niche elephants environment erosion estimated Europe European example exploitation exterminated extinct fauna fishes flora and fauna food chains forest habitats harmful herbivores human hunting increase industrial inhabitants insecticides insects introduced introduced species islands IUCN Kenya land large number living Madagascar mammals man's marine Mediterranean methods million acres mollusks National Park native natural balance natural habitats natural resources nesting North America organic overfishing overgrazing parasites particularly pesticides plankton plant cover poisoned pollution population pounds predators primitive protection rabbit radioactive ravaged regions reserves rivers rodents savannas serious soil South species square miles substances survival swarming territory tion to-day tons toxic transformation trees tropical vanished whales wild Wildlife Zealand zones