I know I've plugged this one before, but.

For thalassius, neonchameleon (following a conversation at the weekend), and anyone else interested in putting numbers to energy supply and usage: http://withouthotair.com is an excellent summary of the figures. Free online or PDF download. Also on paper.

Also, it seems that UKIP are climate-change denialists, and have a leaflet out deriding "Darwinism". If you were planning to vote for them, please don't.