"Or none of the soda at all. "
That would mean that you'd have to find something else to drink! Personally, I thnk that making (and drinking) cider is "green" and good for progress! It's good for the economy, you consume goods, local (?) farmers make money, the carbon footprint is small, there's little in the form of power requirements, no harse chemicals, you are encouraged to reuse/recycle, you consume natural products, fermentation is an efficient process (large amounts of carbs are converted into a smaller amount of higher-energy carbs), etc.
So, for the good of America, drink Cider!
Oh, and, I've been bringing in the .5L sodas and trying to give them away (er, and get bottles back), and one person recommended that the sweetener in soda would be good for my lawn/trees... what do you make of that?