We, in America, have known (whether we think about it or not) most (well, quite a bit) of our oil comes from countries we would know consider destroying.
I live about 2 miles from my office, so for me it is not much of an issue to reconsider using a car. With that, I have surveyed the bike path it would take to get to the office and, I can't.
So a motorcyle is my next best choice. No big hog (aka Harley-Davidson type). Just a simple 500cc-750cc bike. Gas mileage is much better and emmissions is better. Also requires less oil for the engine. Most of the time, here in Texas I can use it.
For those that cannot do without a car (oh ya, we do love out cars), consider using a pure synthetic motor oil. Mobil 1 is a good one. A bit expensive, but so will regular oil in the not too distant future.
Just a thought for those that want to be able to do something and have not figured what to do to help.