ctcleanenergy.com (accessed June 1, 2010). This is a great way to quickly learn about different types of energy production. This site has great visuals accompanied by short, to the point, explanations of the mechanics involved in harvesting the energy.
EIA.gov (accessed July 6, 2010). This site has a lot of statistical information. The data here is up to date and can easily be used to make various types of graphical representations.
Pearce, Fred, Confessions of an Eco-Sinner: Tracking Down the Sources of My Stuff. This book is a quick, interesting read. A lot of facts easily support the opinions and conclusions the author comes to about a consumer society. Good place to go to for discussion topics.
Exline, J. et al. Earth Science. Any text book with up to date information on fossil fuels is helpful. It can be tough teaching science to math students, as a math teacher. By reading a few short sections in a science textbook, a math teacher can get a good idea of how in depth to go with the topics.