Smelly farms may succumb to subtle science

I love the smell of para-cresol in the morning FARMYARDS smell. There is no getting away from that. They smell because of the excrement produced by the animals which live there. And however carefully this excrement is dealt with--whether by modern versions of the time-honoured process of muck-spreading that inject it below the surface of the fields it is fertilising; or by anaerobic digestion, in which it is used to make methane that can, in turn, be employed to generate electricity--it is still...