Many types of jobs will cease to exist: public relations executive, marketing directors, et cetera. I think work will be very hands-on, and a lot of it will revolve around food production.

When I speak before college audiences about peak oil, I often ask if there are any engineers present. I suggest that they concentrate on jobs that will produce rather than consume energy, particularly energy that is renewable and doesn't create greenhouse gas emissions. While it is difficult to tell exactly what kinds of jobs will be available in the post-peak oil age, inklings of some broad principles are coming into view.