...environment if I trade it? I don't like being a polluter. But if someone else is driving it; there will be no improvement even if I start riding a bike to work. That's my dilema. What is the right thing to do besides just stop driving it.

use a cleaner fuel

and when it breaks down dont get another, get a cleaner car

I too have a 740il (1994), I would CRY to get rid of it. How could you?? I'll take it off your hands if you don't appreciate the fine German engineering of a BMW. They are the BEST cars. And the Magnificent 7 is the best. I LOVE mine. Give me yours, I promise to not ever drive it, I'll keep it in the garage, covered....HONEST I would........

Oh, BTW, your CO2 emmissions from your Beemer is not even an issue. Temites cause more CO2 emmisions than we could ever dream of.