I just read "A Short History of Progress", by Ronald Wright(1). Pretty gloomy, if you need any impetus to become either an activist, or completely depressed, this is it. Wright maps the rise an fall of numerous civilisations, and points out that our current technological and social trajectories are pretty similar really. The only real difference between us and the romans, outside of size of the supporting ecosystem, is that we've got evidence of collapse happening before. Well worth reading, especially if you know one of those people who irrationally believe that technology will save us. Now all I need is something to pick me back up.
Where's Wallace Hartley when you need him? Oh, that reminds me - Chumbawamba have a new album out.
1. Wright, R. (2005). A Short History of Progress (p. 224). Da Capo Press. ISBN: 0786715472