Earth Systems - Class on different aspects of Gaia and earth systems at the University of Texas, Arlington. www.uta.edu/geology/geol1425earth_system
Introduction to the Earth System - A class on the Gaia Hypothesis taught at Penn State University. www.essc.psu.edu/~crane/earth_002/contents/announcements/outline.htm
The Gaia Hypothesis - Chapter from the online textbook "Fundamentals of Physical Geography." www.geog.ouc.bc.ca/physgeog/contents/5d.html
The Tangled Web - Overview of Gaia Hypothesis with detailed sections on some aspects and a recommended reading list. www.lawrence.edu/dept/environmental_studies/tangledweb.html
