Sorry this is so long, but it provides a good rebuttle of the Herald article...
Not So Fast with the DDT
Reed Karaim . The American Scholar . Washington: Summer 2005. Vol. 74
, Iss. 3; pg. 53 , 7 pgs
Rachel Carson's warnings still apply
What the World Needs Now Is DDT" read the headline in The New York Times Magazine early last year. If you need more proof that the current decade is dedicated to driving a stake through the heart of the 1960s, those seven words ought to do it. The story itself, by Times editorial writer Tina Rosenberg, lives up to the stridency of its headline. As she surveys the alarming incidence of malaria in sub-Saharan Africa, Rosenberg builds the case that Western environmental sensibilities about DDT use are handicapping the battle against this deadly disease. She writes more than 2,000 words before she gets to Rachel Carson's Silent Spring, the 1962 book credited with spurring concerns about DDT's continuing presence in the ecosystem. But when she finally gets there, she lands a haymaker.
Yes, Carson's book may have saved a bald eagle or two in its day, Rosenberg acknowledges, but "Silent Spring is now killing African children because of its persistence in the public mind." When a writer for the paper that embodies American liberalism accuses a patron saint of the environmental movement of killing African babies, the world has undergone a sea change. If nothing else, we can say that DDT, the once and future miracle pesticide, is back.
The cause has become urgent because of a treaty on organic pollutants signed in Stockholm in 2001 by 91 countries, including the United States. Nine organic pollutants were banned outright. DDT was placed in a secondary category, which calls for a gradual phaseout but allows continued use under certain conditions. DDT supporters believe the treaty-along with widespread disapproval of the pesticide, led by environmental groups-is keeping African nations from using it effectively.
The Times Magazine story proves that the revisionist view is gaining traction. "The tide has clearly been turning the last year or two," says Thomas DeGregori, a University of Houston economics professor who argues for greater use of DDT. Advocates like him insist there is no better weapon in the battle against the mosquitoes that spread malaria. They propose far greater indoor spraying of DDT in African nations. Along the way, they take a healthy slap at the original health concerns about the pesticide. The most extreme proponents of its use (not Rosenberg or DeGregori) even question the evidence that DDT had a deleterious impact on raptors and other wildlife. The United States banned DDT use in 1972, as one of the first big decisions of the government's new Environmental Protection Agency. But reading today's pro-DDT literature, you could easily dismiss that decision as an artifact from a time when muzzy-headed, idealistic longings substituted for hard facts.
DDT probably does have a role to play in battling malaria; indeed, a few African nations use it right now. But the newfound enthusiasm for dichlorodiphenyltrichloroethane comes with a few hitches. The first is that
the pro-DDT people largely ignore evidence that greater use of the pesticide might kill as many African babies as it could save. A second problem is that the insecticide's proponents, either willfully or through ignorance, misrepresent the extent and conditions of the malaria epidemic in sub-Saharan Africa. A third is that they grossly simplify the complexity of disease control in the African environment. A final problem might not be equal in significance to the others, but it should matter to anyone who sees enduring
virtue in great writing: DDT's high priests are unfair to a subtle and beautiful book and the courageous woman who wrote it.
Any re-reconsideration of DDT ought to begin with a look at malaria. Advocates of the pesticide cite two statistics over and over again as justification for greatly expanding DDT use. The first is that malaria is killing between 1.1 million and 2 million people a year. The second, to quote Rosenberg, is that "each year, 300 to 500 million people get malaria." (This is often phrased as "malaria infects" 300 to 500 million people every year.) The first number is chilling, particularly when you consider that malaria is
largely concentrated in Africa and most often kills children under the age of five. But if mortality rates are the measure of a disease problem in the developing world, the truth is that malaria ranks fourth. It trails respiratory infections, diarrheal diseases and, in Africa, AIDS. Among children under five worldwide, the World Health Organization ranks the leading causes of death by disease as "acute lower respiratory infections, mostly pneumonia (19 percent of all deaths), diarrhea (18 percent), malaria (8 percent), measles (4 percent), and HIV/AIDS (3 percent)."
The HIV/AIDS number is deceptive since children born with the HIV virus do not necessarily die in the first years of their life. The largest killer of young children is not even on that list. The World Health Organization has a catchall category called "neonatal conditions," which includes preterm birth,
low birth weight, and other immediate problems that kill 37 percent of the 10.6 million children the World Health Organization estimates die every year before their fifth birthday.
It's important to be clear here. Malaria is a serious problem, a disease that often kills. But if saving children in the developing world is the paramount concern, the most attention should be paid to basic issues of health: clean drinking water, which could greatly reduce diarrheal disease; adequate diet,
which would make a big difference in preterm and infant deaths; and healthier living conditions, which would reduce the awful number of children dying from respiratory infections. But what about the 300 to 500 million people who "get" malaria annually? When most people hear that, I believe they think "new cases." (After all, you can't get it if you got it, right?) If that were true, then we would be in the middle of terrifying global epidemic. There are only 6.4 billion people on the planet, so we're all going to be sick within the next 13 years or so.
But that's not what the number means at all. Eline Korenromp, the World Health Organization analyst in Geneva behind the study cited when the figure is used, told me that the statistic is an estimate of "incidence of clinical disease episodes" of malaria in a year. In other words, it's the number of times people exhibited symptoms of malaria-not new cases, or even existing cases. The malaria parasite can be eliminated from the body with the right treatment, but in certain parts of the world it persists in many people for years, and they face recurring symptoms. Others have the disease but show no symptoms. The World Health Organization, Korenromp says, has no estimate of how many new people catch malaria each year.
Three hundred million to 500 million incidences of malarial symptoms does not mean the disease is sweeping the globe (the number of people infected with tuberculosis worldwide has been estimated to be as high as two billion). But it does mean that if we have a completely safe tool to battle the disease, we should use it, no matter where malaria ranks in the hierarchy of developing-world ills. And this is how DDT is being portrayed by supportersas the misunderstood little pesticide that could save the world.
Silent Spring originally sparked concern by tracing how DDT accumulates in the food chain. Evidence that the pesticide was hurting the population of birds of prey, particularly by thinning the walls of their eggshells, was one of Carson's more vivid examples of the damage being done by the widespread outdoor spraying of the toxin that took place in the 1950s and early 1960s. The evidence that DDT can harm wildlife is extensive. Early studies also indicated that DDT might be a carcinogen in humans, particularly with regard to breast cancer. (The compound concentrates in fatty tissue.) Subsequent studies did not bear out the cancer link, and it is brushed aside by DDT proponents. They also say that spraying DDT on the indoor surfaces of huts subjects people to smaller doses than aerial spraying. "Sometimes people will condemn a technology for the way it was used before we know how to use it right," says DeGregori. "If you use DDT properly, it has a record of safety and effectiveness for humans that is really unmatched."
Continued.....