In article ,
Serendipity wrote:

How is burning grain environmentally friendly?

Grain is a renewable resource unlike fossil fuels.

Renewable makes it a [possibly] sustainable resource but has nothing to
do with its environmental friendliness. I don't know how much energy can
be extracted by burning raw grains (without conversion to a different
from first) but I would suspect the conversion is quite inefficient and
is not in fact sustainable in the large scale (i.e. we could not grow
enough to heat all our homes). That is only a guess though.

That said, if there is an excess of grains going very cheap nearby you
and they can be burned relatively cleanly, it might be a good idea under
certain circumstances both from an environmental point of view (less of
one million evils) and sustainability (local use only).

PK