Tim Jackson's economic reality check (Video on TED.com) is a fascinating reflection on what it is to be a member of society today. It's about as zeitgeisty as it gets in a lecture hall, especially from an economist. The principle is, well, the title of his book, really: Prosperity without growth. Historically, the two have always been tied together: companies grow profits, increase market share/value; countries increase GDP; I buy a bigger house/car. His argument is that this is not sustainable, so we need to review this assumption at both personal and societal levels.
It made me think about a lot of things, not only concerning my life, but the world my kids are emerging into, and the issues they are going to face. All in a very upbeat and sensible way - no fear-mongering, moralistic ranting here.