@epic @lain @mlg @cjd @mithrandir

From first hand experience, cow dung isn't that bad as fuel - yes, I've done that in mountains a few times out of curiosity :) What is really bad for health is burning any solid fuel in a confined space like hut.

And of course if many people are involved, effect of scale kicks in and you end up with vast treeless areas as in Wales because biomass has even worse power density than PV and wind.