There's a nice worksheet that I'll make available in class and it's based on an article about the carbon footprints of businesses. You can explore the idea of carbon footprints in more detail from the following links:
http://www.carbonfootprint.com/green_energy.html
http://www.nrel.gov/
http://www.safeclimate.net/understanding/
http://en.wikipedia.org/wiki/Carbon_footprint
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