For well over half a century, since the first credible warnings of petroleum depletion were raised in the 1950s, contemporary industrial civilization has been caught in a remarkable paradox: a culture more focused on problem solving than any other has repeatedly failed to deal with, or even consider, the problem most likely to bring its own history to a full stop. The coming of peak oil-the peaking and irreversible decline of world petroleum production-poses an existential threat to societies in which every sector of the economy depends on petroleum-based transport, and no known energy source.