That elusive oil independence

Bush gave a speech on energy yesterday:

WASHINGTON (AP) - President Bush said Wednesday that the United States has to "get off oil" to reduce dependence on foreign suppliers and declared "it should be obvious" that high demand is creating painful gasoline prices.

Why yes, yes it is obvious that high demand is raising gasoline prices. But I am intrigued by the blithe statement that we should "get off" oil. What, I wonder, does he think we should substitute, not only for gasoline, but for fertilizer and plastics? Or the hundred other uses to which we put petrochemicals?