here's something else to consider: it also takes energy to MAKE new vehicles. one way you can help the environment is to keep an old car running rather than buying a new one. something generally not considered. everyone loves to focus on cars, but come on; we desperately need to focus on companies, energy production, and other countries less fortunate and more poluting.
i'm a huge environmentalist, but my primary desire is to see areas kept pristine. water polution, smog, trash, CONSTRUCTION; we have to live somewhere, but if you're like me (and i bet you are since you have a 4wd) you love and want to protect our wild places. don't let them take away our national parks, forests, all that.
i personally think global warming is unrealistic, but i'd be willing to be convinced otherwise. i'm generally a very energy concious person. i don't heat my apt or use AC. neither in my car. right now i drive a 91civic that gets over 40mpg highway. i turn lights off, use as little energy as possible.
the thing that i keep coming back to is the need for government involvement. getting on the backs of corporations and forcing them to higher standards of efficiency; grants and funding for alternate energy products.
more than anything i think we won't be saved by hydrogen fuel cells (a peculiar idea), or any other "space age" technology, but rather with better use of our current natural resources. water, wind, and (especially) sun. perhaps rather than putting a bomb in your car

(hydrogen fuel cell), we could concentrate on building millions of solar panels out in the desert; and funding technology to make wind/water/solar more efficient. these are technological increases that don't take magic.
don't forget where you get your power. the absolute stupidist idea of all time is the electric car. well where the hell did the electricity come from? maybe burning coal? ridiculous. now if that electricity was being produced by solar, it would be a different story. and what about solar pannels on individual homes? these are real, valid and economically feasable possibilities. and really, as egalitarian as we want to be, the only real changes come when something is economically favorable.
don't be a NIMBY (not in my backyard); concentrate on what we can do; keeping our wild places, and our cities too, clean and protected.
and for crying out loud please remove the 4-billion gift shops, 5-star hotel, and jail (i'm not kidding, there's a jail) from yosemite valley............bastards
/rant over
