Et forsvar for
dichlorodiphenyltrichloroethane

Diverse — Drokles on September 29, 2012 at 7:45 pm

The Commentator har en glimrende artikel om de millioner af menneskeliv DDT har sparet ved først og fremmest at bekæmpe malaria. Men alt godt får en ende og enden er ofte rød-grøn

Then, in 1962, “Silent Spring” by Rachel Carson was published – supposedly documenting the effect of DDT on the environment in harming and even killing not only animals and birds, but also humans. More specifically, the book details alleged causal links between DDT and breast cancer and diabetes in humans, as well as the effects of DDT on egg shell fragility in birds of prey in particular, leading to reductions in population.

The book’s publication and its influence were profound. It is no coincidence that Al Gore, on its reissue in 1994, wrote an introduction extolling Carson’s book: “Because Carson’s work led to a ban on DDT, it may be that the human species…or at least countless human lives, will be saved because of the words she wrote.” The clown prince of man-made global warming can’t help himself.

Ultimately, DDT was banned in the USA in 1972, with most developed countries following in the 1970s and 1980s.

(…)

But let’s look at the evidence on DDT. On breast cancer, a study was published in the New England Journal of Medicine in 1997, “Plasma organochlorine levels and the risk of breast cancer”. It concluded that “Our data do not support the hypothesis that exposure to DDT and PCBs increases the risk of breast cancer.” This study is not unique.

Another supposed victim of DDT, the Birds of prey group, has had its numbers closely monitored in the U.S and the number of ospreys grew during DDT usage – from 191 in 1946, to 288 in 1956, to 457 in 1967, and 630 in 1972. A 1969 review of Organochlorine pesticides in Britain found falcon reductions had finished in 1966 despite the use of DDT. It said: “There is no close correlation between the decline in population of predatory birds, particularly the peregrine falcon and the sparrow hawk, and the use of DDT.”

Finally, the hysteria surrounding DDT and the quality of eggshells is also based on shakey ground. The Cecil, Bitman, Harris paper found no effect on eggshells, if adequate calcium is in a DDT diet. Published in Poultry Science in 1971 it concluded: “When carefully reviewed, Dr. Bitman’s study revealed that the quail in the study were fed a diet with a calcium content of only 0.56 percent (a normal quail diet consists of 2.7 percent calcium). Calcium deficiency is a known cause of thin eggshells. After much criticism, Bitman repeated the test, this time with sufficient calcium levels. The birds produced eggs without thinned shells.”

The Dr. ML Scott et al. study in 1975 concluded: “Dietary polychlorinated biphenyls (PCBs), DDT and related compounds, in well controlled experiments, produced no detrimental effects upon egg shell quality”

In 2004 the late Dr. Gordon Edwards, Professor Emeritus of Entomology at San Jose State University, wrote a devastating critique and bluntly opined: “The ban on DDT, founded on erroneous or fraudulent reports and imposed by one powerful bureaucrat, has caused millions of deaths, while sapping the strength and productivity of countless human beings in underdeveloped countries. It is time for an honest appraisal and for immediate deployment of the best currently available means to control insect-borne diseases. This means DDT.”

Som Chesterton observerede så holder folk ikke op med at tro blot fordi de holder op med at tro på Gud.

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