more: we would need extra acres to grow the cows whose manure would fertilise our fields: more precisely, to replace all the industrial nitrogen fertiliser now applied would mean an extra seven billion cattle grazing an extra thirty billion acres of pasture. (You will often hear organic champions extol the virtues of both manure and vegetarianism: notice the contradiction.) But these calculations show that even without vegetarianism, there will be a growing surplus of farmland. So let’s do
