@Thomas,
Such a book doesn't have to proselytize, the streets are full of militant, sometimes even ranting vegetarians and vegans. College towns are the worst. The Beef Council and the Pork Council (or whatever they are calling themselves these days) spend money on television advertisements, but its hardly likely that they're going to do research into the deficiencies of a vegetarian diet. Their interest is in selling their product, not engaging in some kind of culture war. Vegetarians and vegans, however, are interested in culture wars, and most of their advanced bases are college campuses, and academic scientists are often their allies. I habitually mistrust attacks on meat consumption, and claims about the manifold benefits of vegetarianism. The people who wrote your book don't have to proselytize, there are already legions of militant (usually young) vegetarians out there willing to do that, and often in a hectoring, ranting tone. FM has addressed things i have read myself, but if you think it will help your social standing to portray yourself as a vegetarian, help yourself.
Certainly why not oppose those cruelties. That's what i'm asking, why are the militant young vegetarians as vocal and insistent upon opposing those cruelties?
I'd be interested in the data you have that people in what was called the third world have "already slowed down their birth rates considerably." I didn't say that their birth rates were increasing, in any event, so that is a straw man. I'm simply pointing out that in primitive agricultural societies, and especially those in which there is no provision for old age pensions, there is always a motive for large families, which motive disappears with greater economic security.
Certainly i'm referring to all humans on the planet, i don't know that RG has limited the discussion to any more discrete group. However, my remarks were addressed to typical vegetarian propaganda, which decries the use of arable land to provide feed for feed lot animals, but remains mute on the subject of how much arable land is devoted to non-food producing activities, such as growing flowers for the cut flower industry. There are much better reasons to oppose the feed lot industry, and i frankly would like to see it eliminated--but not unless it means that livestock for meat are then raised through grazing, which is a use for arable land which i consider justified, and which would be even more plausible if it were a part of a broader program which addresses other issues not normally discussed in a narrowly focused discussion like this, with population reduction at the head of the list.
I know of no large-scale subsidy program to encourage the use of arable land for the production of ethanol. I know that there are such programs, but they're modest in comparison to programs such as the land bank, which is regularly scammed by corporate capitalists. The main reason that a lot of land is given over to production of grain (usually what Americans call corn) for ethanol is that it is a much more reliable market for a farmer's grain than the widely fluctuating grain market for animal feed or human foods. Farmers know they can get a good price for their corn for ethanol, and a relatively reliably predictable price than is the case with producing grain for animal or human consumption. I don't think blaming the Senate for this is very realistic.