Human impact on the ecosystem / Joy Tivy, Greg O'Hare ; maps and diagrams drawn by Ann Rooke and Andy Skinner. Tivy, Joy. O'Hare, Greg. Nature Effect of human beings on. Human ecology. GF75 .T58 1982 574.5223 19 TIH Includes bibliographical references and index. Edinburgh ; New York : Oliver & Boyd, c1982. c1982. 1982 Text 243 p., [4] p. of plates : eng Conceptual frameworks in geography