Film vs. Digital, What's good for the Environment?

We have been using digital cameras for a few years now, and it's our observation that we are saving money in not having to buy film and having it processed, but we are also reducing the chemical load on the environment, as film processing requires chemical that are supposed to be properly disposed of, but often are not. Our cameras (a HP Photosmart 320 and a Pentax Optio M20) both use our NiMH rechargeable AA batteries, so we do not have to purchase and dispose of tons of batteries either. Available from Amazon.