Sheesh. These discussion sure tend to quickly go down the rabbit hole. It appears to me your point is that nobody should use disposable (or even rechargeable) batteries because they all contribute to the waste stream. That's different than the point I was making. I was responding to the assertion that someone should not choose disposable batteries because many people don't dispose of them properly. That's why you don't think they should. I was specifically making the point that others not disposing of batteries properly does not need to affect someone's decision. They can choose anything they want regardless of what others are doing with their batteries. Let me put it this way: The fact some recycle batteries, some throw them in the trash, and some choose to not use batteries at all does not control what I choose to do.

I'll just point out that dyno lighting isn't free of environmental impact either, though it's likely less than using various types of batteries. There's waste generated when they're manufactured and they'll eventually wind up in the trash or recyclers at some point in the future. And the power is provided by the rider via the food he/she eats, the production and transportation of which has it's own environmental footprint. Granted, it's not a lot. To generate 15 W of output you likely need at least 22 W of input which equates to the rider burning about 80 Cal/hr, along with it's attendant production of CO2.