I wonder if there is replacement for plastic used in keyboards. Ergonomic design is cool and all, but have you tried typing on something which feels natural and eco-friendly? I personally would expect Apple to come up with such a product as they've already used other green materials in cables. But it would definitely be nice if these keyboard producers put some emphasis on environment-friendliness.
If Apple really cared about the environment they'd make their devices more maintainable to dramatically reduce waste. But their current strategy to push against right to repair and having insane repair prices shows where their real priorities lie.