Mackenzie, Fred T. Our changing planet an introduction to earth system science and global environmental change Fred T. Mackenzie - 2nd ed. - New Jersey Prentice Hall 1998 - x+486p. figs;glossary;illus;index;refs;study questions & answers ISBN: 013-271321-7 Subjects--Topical Terms: Environmental SciencesGlobal Environment ChangeHuman EcologyNature Universal Decimal Class. No.: 551.1/.4 / MAC