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:

As David puts it:

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I attended the Teignbridge District Council planning committee meeting at Forde House in Newton Abbot earlier today. I was there objecting to the proposed Tedburn St. Mary solar PV farm, and the members ultimately voted to refuse the application with a ratio of 3:1. Over coffee after the vote my local district councillor pointed out to me that a request for a screening opinion had been received for a 23.3 hectare solar PV park near Starcross.

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