Even if the Greenhouse effect is a farce, the U.S. needs to become less dependent on fossil fuels anyway for economic and national security reasons. Either way, there is going to be a paradigm shift in the US eventually, whether people want to acknowledge the problem now or ignore it.
It's funny to read stuff like, "we emit the most CO2, because we're the most productive.", because it's a half truth. Sure, production takes energy, but a lot of CO2 comes from people just lollygagging around in bug trucks (i'm guilty as well). How productive is that? Plus, fifty years ago before all these environmental regulations, we polluted much more per capita. Does that mean we were more productive per capita then? Don't think so.
Our ability to remain productive is already being stunted by increasing scarcity of refined fuel sources and increase in prices. The sooner we shed this monkey off our back, the better off the US will be in the future.
Plus, I've said it before and I'll say it again. Energy companies spend mucho dinero to make us believe that alternative energy is unfeasible.