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—many plant species are apt to benefit from elevated CO2 levels—and 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’s 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. “You give them generations on generations to survive in these conditions, and yet they’re not there,” Hall-Spencer observed.
Of course the activists—not those whose thinking had become rigid, but those whose approach to revolution was imaginatively anarchic—had long ago grasped the reality which still eluded the press: we were seeing something important. We were seeing the desperate attempt of a handful of pathetically unequipped children to create a community in a social vacuum. Once we had seen these children, Ave could no longer overlook the vacuum, no longer pretend that the society’s atomization could be reversed. This was not a traditional generational rebellion. At some point between 1945 and 1967 we had somehow neglected to tell these children the rules of the game we happened to be playing. Maybe we had stopped believing in the rules ourselves, maybe we were having a failure of nerve about the game. Maybe there were just too few people around to do the telling. These were children who grew up cut loose from the web of cousins and great-aunts and family doctors and lifelong neighbors who had traditionally suggested and enforced the society’s values. They are children who have moved around a lot, San Jose, Chula Vista, here. They are less in rebellion against the society than ignorant of it, able only to feed back certain of its most publicized self-doubts, Vietnam, Saran-Wrap, diet pills, the Bomb.They feed back exactly what is given them. Because they do not believe in words—words are for “typeheads,” Chester Anderson tells them, and a thought which needs words is just one more of those ego trips—their only proficient vocabulary is in the society’s platitudes. As it happens I am still committed to the idea that the ability to think for one’s self depends upon one’s mastery of the language, and I am not optimistic about children who will settle for saying, to indicate that their mother and father do not live together, that they come from “a broken home.” They are sixteen, fifteen, fourteen years old, younger all the time, an army of children waiting to be given the words.