Can anyone say tidal wave?
First peak oil, and now the kicker: poor and industrializing nations are rapidly increasing the amount of oil they consume, and many major oil-exporting nations within 10 years may become net importers. Since the US currently imports 65% of the oil we consume, where is our oil going to come from?
The US is so screwed... our obsession with the automobile is rapidly meeting its doom. It seems our future may be defined by bicycles and electric cars. Hell, I live in Portland - and we've already been touted as the trend-setter for urban policy, as far as land-use planning and transportation, for around 20 years.
Course, there are all sorts of other interesting technologies being developed that have the potential to supplement and fill in various roles for energy usage and transportation...