Fair or not, the US is still responsible for 28% of the worlds carbon dioxide emissions
24% according to Wikipedia, but we're also responsible for 28% of the world's GDP (nominal), so it's not that insanely bad. It's still nowhere near as good as the EU (30% GDP, 15% emissions), and pretty much at the bottom of industrialized countries, but it isn't as horrible and evil as many people make it out to be.
Frankly, I wouldn't mind seeing gas prices go up to $5/gallon ($10+ in EU) in the near future. Yes, it would suck, but maybe it would finally make people realize that they need to change their driving habits, the kinds of cars they buy, and so forth. The only way things are going to get better is if the market forces them to.