The greenest way to wash your car is to take it to a car wash. It's much better for the environment than doing it at home, unless you are just using water to clean your vehicle. Car washes recycle the water used for washing cars. The waste water is cleaned and filtered. If you wash your car at home the chemicals wind up either in your yard or garden or they end up getting washed down the sewer, which leads to creeks, rivers, lakes, ponds, or oceans. These chemicals are not good for wildlife! Next time you need your vehicle washed plan it on the way to or from somewhere else, don't make a special trip, and take it to the car wash!
NO, not right now. There are no such things as sustainable airlines, contrary to what some might say. It's just not possible with technology right now. There are ways to reduce your impact from air travel, but it's not possible to do both fly and leave no footprint.
Some things you can do to reduce your impact are to research airlines and their standards and to only book non-stop fights as every take off and landing produce more carbon than regular flying. Research individual airlines' stats on emissions and percentage of seats filled to find the one that is most efficient with the energy they use. Continental has been listed in several places as the greenest airline, however, I haven't done the research myself.
Trains are one of the greenest ways to travel!
If at all possible, take a train instead! Trains are much more efficient than airlines and autos, and also their ticket prices are very reasonable. Check out local rail travel options.
After a nearly 3 month hiatus I am finally back online. My old computer bit the dust and since it's summer I've been so busy outdoors that I forget about the internet! I just bought a new Compaq computer. One of the main reasons for choosing it was the price but it came with an added bonus, it was voted the greenest computer by Newsweek in 2009. It even has a sticker:
Watch out, blogosphere, I'm back greening things here and there and everywhere!