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extinction

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I am opposed to animal welfare campaigns for two reasons. First, if animal use cannot be morally justified, then we ought to be clear about that, and advocate for no use. Although rape and child molestation are ubiquitous, we do not have campaigns for __umane_ rape or __umane_ child molestation. We condemn it all. We should do the same with respect to animal exploitation. Second, animal welfare reform does not provide significant protection for animal interests. Animals are chattel property; they are economic commodities. Given this status and the reality of markets, the level of protection provided by animal welfare will generally be limited to what promotes efficient exploitation. That is, we will protect animal interests to the extent that it provides an economic benefit.

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We should always be clear that animal exploitation is wrong because it involves speciesism. And speciesism is wrong because, like racism, sexism, homophobia, anti-semitism, classism, and all other forms of human discrimination, speciesism involves violence inflicted on members of the moral community where that infliction of violence cannot be morally justified. But that means that those of us who oppose speciesism necessarily oppose discrimination against humans. It makes no sense to say that speciesism is wrong because it is like racism (or any other form of discrimination) but that we do not have a position about racism. We do. We should be opposed to it and we should always be clear about that.

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Three hundred types of mussel, a third of the world__ total, live in the Smokies. Smokies mussels have terrific names, like purple wartyback, shiny pigtoe, and monkeyface pearlymussel. Unfortunately, that is where all interest in them ends. Because they are so little regarded, even by naturalists, mussels have vanished at an exceptional rate. Nearly half of all Smokies mussels species are endangered; twelve are thought to be extinct.This ought to be a little surprising in a national park. I mean it__ not as if mussels are flinging themselves under the wheels of passing cars. Still, the Smokies seem to be in the process of losing most of their mussels. The National Park Service actually has something of a tradition of making things extinct. Bryce Canyon National Park is perhaps the most interesting-certainly the most striking-example. It was founded in 1923 and in less than half a century under the Park Service__ stewardship lost seven species of mammal-the white-tailed jackrabbit, prairie dog, pronghorn antelope, flying squirrel, beaver, red fox, and spotted skunk. Quite an achievement when you consider that these animals had survived in Bryce Canyon for tens of millions of years before the Park Service took an interest in them. Altogether, forty-two species of mammal have disappeared from America's national parks this century.

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Bill Bryson

A Walk in the Woods

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Ocean Acidification is sometimes referred to as Global Warming's Equally Evil Twin. The irony is intentional and fair enough as far as it goes... No single mechanism explains all the mass extinctions in the record and yet changes in ocean chemistry seem to be a pretty good predictor. Ocean Acidification played a role in at least 2 of the Big Five Extinctions: the End-Permian and the End-Triassic. And quite possibly it was a major factor in a third, the End-Cretaceous. ...Why is ocean acidification so dangerous? The question is tough to answer only because the list of reasons is so long. Depending on how tightly organisms are able to regulate their internal chemistry, acidification may affect such basic processes as metabolism, enzyme activity, and protein function. Because it will change the makeup of microbial communities, it will alter the availability of key nutrients, like iron and nitrogen. For similar reasons, it will change the amount of light that passes through the water, and for somewhat different reasons, it will alter the way sound propagates. (In general, acidification is expected to make the seas noisier.) It seems likely to promote the growth of toxic algae. It will impact photosynthesis__any plant species are apt to benefit from elevated CO2 levels__nd it will alter the compounds formed by dissolved metals, in some cases in ways that could be poisonous.Of the myriad possible impacts, probably the most significant involves the group of creatures known as calcifiers. (The term calcifier applies to any organism that builds a shell or external skeleton or, in the case of plants, a kind of internal scaffolding out of the mineral calcium carbonate.)...Ocean acidification increases the cost of calcification by reducing the number of carbonate ions available to organisms that build shells or exoskeletons. Imagine trying to build a house while someone keeps stealing your bricks. The more acidified the water, the greater the energy that__ required to complete the necessary steps. At a certain point, the water becomes positively corrosive, and solid calcium carbonate begins to dissolve. This is why the limpets that wander too close to the vents at Castello Aragonese end up with holes in their shells.According to geologists who work in the area, the vents have been spewing carbon dioxide for at least several hundred years, maybe longer. Any mussel or barnacle or keel worm that can adapt to lower pH in a time frame of centuries presumably already would have done so. __ou give them generations on generations to survive in these conditions, and yet they__e not there,_ Hall-Spencer observed.

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Elizabeth Kolbert

The Sixth Extinction: An Unnatural History