The book by David MacKay, "Sustainable Energy: Without the Hot Air" is available at http://www.withouthotair.com.
There is also a blog at http://withouthotair.blogspot.com/ that has other interesting information on sustainability
including some ideas for games and demonstrations that illustrate energy consumption.
My favorite is his list of 4 things you can do each
week with approximate energy savings (see below)
You might want to check it out!