When I was commuting by bike, I did it:

1. Because I didn't and don't have a car (and don't want one).

2. Because it was a lot more convenient than the bus, often.

3. Because I didn't have to listen to religious nuts spouting off on the bus, if I was alone on my bike. I could spout off to myself.

4. Because I enjoyed riding my bikes.

5. As a form of protest against the appalling over-use of motor vehicles in this world (closely related to reason no. 1).

6. Because it made me feel better when I was at work.

7. Because it also made me feel better when I was at home.

8. And because it sometimes made me feel better in between home and work.

Now that I no longer commute, I stare at the computer monitor a lot, and post things like this.

Will it have made a difference? Of course--every action we undertake makes a difference that reverberates through the rest of our life and through the whole world.

But it's really of not the slightest interest to me what difference it makes.