Let’s go point by point. First, that grass-grazing cows emit more methane than grain-fed ones. This is factually false. Actually, the amount of methane emitted by fermentation is the same whether it occurs in the cow or outside.Huh? I'd never heard that before, and it seems unlikely. According to this EPA web page:
Livestock manure management. Methane is produced during the anaerobic (i.e., without oxygen) decomposition of organic material in livestock manure management systems. Whether the feed is eaten by an herbivore or left to rot on its own, the methane generated is identical. Wetlands emit some 95 percent of all methane in the worldWhich is what I suspected when I read what Salatin wrote. If the grass were to decompose in a field, rather then in "wetlands" it wouldn't emit as much methane as it decomposed, rather, I would guess CO2 would be released, which is actually much less harmful per molecule as Methane when it comes to the greenhouse effect.
one of the biggest reasons for animals in nature is to move nutrients uphill, against the natural gravitational flow from high ground to low groundis one of those profoundly simple ideas that feels illuminating to encounter, and not something I'd ever considered before.
It's also complete nonsense. The polyface guy is a religious nutter, and this is clearly a religious idea (the assumption that animals have a 'purpose', when in fact, they arose through natural selection for no reason other then their own)one of the biggest reasons for animals in nature is to move nutrients uphill, against the natural gravitational flow from high ground to low groundis one of those profoundly simple ideas that feels illuminating to encounter, and not something I'd ever considered before.
Maybe it doesn't (at least not obviously), but nature is all about systems and sustainability.Please. nature isn't "about" anything other then the the increase of entropy. The earth is not fundamentally sustainable, without human intervention all life will be extinguished in a few hundred million years as the sun gets brighter due to hydrogen/helium ratios changing, and the surface becomes so hot that the oceans boil away.
Finally, there is no avoiding the fact that the nutrient cycle is interrupted every time a farmer steps in and slaughters a perfectly healthy manure-generating animal, something that is done before animals live a quarter of their natural lives. When consumers break the nutrient cycle to eat animals, nutrients leave the system of rotationally grazed plots of land (though of course this happens with plant-based systems as well). They land in sewer systems and septic tanks (in the form of human waste) and in landfills and rendering plants (in the form of animal carcasses).It's not something that most people want to know about but your processed shit, the hard to dispose of parts called biosolids, are commonly sprayed back into agricultural fields.
Isn't that how natural selection works? If a species is particularly suited to a role that helps it survive, it's going to grow more and more into that role over generations. Sometimes, these roles involve multiple organisms, such as cows producing manure that helps grass grow. Eventually, nature stabilizes into these webs of relationships that keep everything in relative balanceWell, the problem is the implication of "purpose." Animals moving "nutrients" up hill may be something that happens, but if the particular animal does not benefit from plants growing in those locations then as far as the animal is concerned it's just a side-effect, not it's "purpose".
Apparently if you lie often and big enough, some people will believe it: Pastured chicken has a 20 percent greater impact on global warming? Says who? The truth is that those industrial chicken houses are not stand-alone structures...This doesn't even consist of a refutation of McWilliams' point. Instead, Salatin says what amounts to "I don't believe you. And it's complicated," which I am quite sympathetic to, but it doesn't make an effective argument against McWilliams unless he follows up with a convincing attempt at estimating the impact of various sources.
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Oh, and congratulations, your post entered the blue at 4:20 pm. Well done, Gov.
posted by lometogo at 2:33 PM on April 23, 2012 [1 favorite]