LOL, once again this debate proves that smallholding is absolutely context specific!
Since Clarebelle lives in Orkney (lots of sandy beaches but very few trees), her "Best Possible Environmental Option", to use the correct jargon is quite clearly beach sand. It's not in short supply on Orkney, and can easily be disposed of after use by putting on the garden or whatever, since a little will go a long way.
Now, I'm not sure about the sand situation in Sweden, but I'd hazard a guess that for Lingon, the most environmentally friendly option would be sustainably sourced wood shavings.
Likewise, since Doganjo and myself have a ready supply of shredded office paper, it makes sense for us to use that and to subsequently compost it.
So really the best way to read threads like this is not to read them as "what's better, A or B?", but really "what does everybody else do, and is that better for my own situation than what I currently do?"
.