Do you have a link to the Wimploe study MF? Always best to go back to source.
It's quite a wobbly conclusion to draw to say that the increased organic matter is due to the absence of ploughing. Without knowing how the experiments were conducted, what parameters were considered, we can't know if that is a reasonable conclusion to draw from the evidence. I'm sure there are lots of factors at play here, for example that in woodland there is leaf litter which has lain there as long as the trees. Similarly, grass land tends to have far more mole activity than arable fields, as they are not disturbed by ploughing, so can incorporate dead grasses and dung - yes so that supports keeping animals v prairie farming, but not whether organic methods of raising crops gives a different result. I'm not saying we should all become vegetarian or vegan, just reduce the amount of meat, to increase our health, and reduce the need for such vast chicken production units, and allow outdoor rearing methods.
Organic crop production, with mixed farming, allows plenty of organic matter to be returned to the soil, so there should be a big difference in the organic matter between organic and chemical arable methods. Is Wimpole run on organic lines, or conventionally? I know they have lots of animals so there should be plenty of dung
For the greenhouse gas output of housed versus outdoor livestock, I'm not aware of a major study on this point. There are studies on housed cattle, where their gaseous outputs can be collected and measured. I think it's very likely that the emissions of outdoor reared cattle will be captured by the grass and trees before heading skywards, but has anyone measured this?
Cattle kept indoors, or in feeding lots as in the US, are fed lots of grain, rather than grass, so their emissions may not be comparable. Has this comparison been researched?
There is apparently plenty of evidence that reducing the amount of meat we eat in the West will improve our health - don't ask me for any links though
I truly believe in the motto 'moderation in everything', and this applies to what we eat too. Nobody
needs a one pound steak, or meat at every meal, so to encourage people to reduce their meat consumption to about 5 meals per week seems reasonable. That would leave a bit of room for the animals we rear to eat to have a bit more space, and better living conditions.