Half Empty or Full?

Is Your Tank Half Empty or Half Full? - Op-Ed - NYTimes.com:

High gas prices have had some obvious immediate effects on Americans: Hummer sales are down, commuting by public transit is up, airlines are charging for nonessentials, like baggage. But if $4 gas (or higher) is here to stay, we can expect our lives to change in other ways, too. The Op-Ed page asked 10 writers to reflect on the consequences — unexpected, unnoticed, unrealized, good, bad or indifferent — of really expensive fuel.