"The Climate Puzzle" Planet Earth (Annenberg/CPB)  Scientists piece together the history of Earth's changing climate. (57:26)

Go to the Planet Earth site and scroll to "The Climate Puzzle". One-time, free registration may be required to view film. 

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For Citation: Ritter, Michael E. The Physical Environment: an Introduction to Physical Geography.
2006. Date visited.  http://www.uwsp.edu/geo/faculty/ritter/geog101/textbook/title_page.html

© 2003-2011
Michael Ritter (tpeauthor@mac.com)
Last revised 06/16/07