Greenspan on oil (speaking to the the National Italian American Foundation, which De Niro would never do :) "We will begin the transition to the next major sources of energy perhaps before midcentury as production from conventional oil reservoirs, according to central tendency scenarios of the Energy Information Administration, is projected to peak." And just to make it political, here's a chart relating presidential approval ratings to gas prices!
Demography is destiny Alan Greespan in Senate testimony discusses the implications of an aging population. While the US is getting older, other countries are relatively young. Can immigration and technology provide, as Greenspan says, a "potent antidote for slowing growth in the working-age population," or are such projections academic?