Professor David MacKay used to work in the Physics department of Cambridge University. Now he's the Chief Scientific Advisor to the UK's Department of Energy and Climate Change. Here's a video in which he explains how he halved his own personal energy consumption, and how you can too:
The September 2008 edition of Environment Magazine contains an article entitled "The Short List: The Most Effective Actions U.S. Households Can Take to Curb Climate Change". The article is a collaboration between two scientists who specialize in the psychological aspects of climate change; the reasons why individual citizens do not take actions that would reduce their personal energy consumption, even when such changes can be achieved at no cost or allow money to be saved.