You're very welcome. Later on, he points out that whether it's peak oil or "peak access to additional hydrocarbons," there is no getting out of the predicament we are in:

The National Petroleum Council, in its recent study...said that we will not be able to produce any more conventional oil after 2022, 2023, some 15 years out. Unlike the peakists, they do not attribute this to the limitation on resource but they attribute it to the limitation on access. But whatever the reason, bear in mind, we face a painful transition to the future in which we hit a limitation, a plateau as you were in the ability to produce crude oil and we might begin effectively to start making adjustments to that transition now rather than later.
Think of it in the large. We are producing 86 million barrels a day. We have a present decline curve of 5 per cent, 4.5 per cent. If you look out to 2030 and if you assume, as the EIA does, that conventional oil will rise to about 105 million barrels a day, that means that we must find or develop, given the decline curve and the higher aspirations, the equivalent of nine Saudi Arabias. I think the probability of being that successful is very low.
— James Schlesinger's Speech at The National Academies Summit on America's Energy Future - The Geopolitical Context of America's Energy Future; Day 1, Part 3, March 13, 2008