I cannot think of a greener method of transportation than using your own power to get yourself around. Whether walking, running or pedaling, not only are you not emitting, your also getting good excercise. Granted, this time of the year in many areas, riding a bike is a bit more difficult (just ask Sebastian). But, if you are going to go without your car, at least be careful out there! Don't ride anything like these guys!
These are bike messengers in New York. I have heard about them before, but this is the first I have seen them on video. One word: CRAZY.[Source: YouTube]