- Historic Sites
The American Environment
THE PICTURE IS MORE HEARTENING THAN ALL THE LITTLE ONES
October 1993 | Volume 44, Issue 6
Today, nearly a quarter-century after the crusade to the new Jerusalem of a clean environment began, there is vast progress to report. In 1959, 24.9 million tons of particulate matter—soot—were emitted into the air in the United States. By 1985, 7.2 million were, and less every year. In 1970, 28.4 million tons of sulfur oxides, a prime contributor to smog, were released by power plants and automobiles. In 1990, 21.2 million tons were, a drop of nearly 25 percent. Carbon monoxide emission has fallen by 40 percent since 1970, and lead has been eliminated as an additive to gasoline.
Cars being manufactured in the 1990s emit only a fifth as much pollution as those made before 1975. Thus 80 percent of all automobile pollution today is generated by just 10 percent of the cars on the road. In the next few years, as these clunkers end up on the scrap heap, automobile pollution will decrease sharply.
Already the number of days per year when the air quality is below standards in most of the country’s cities has fallen significantly, by 38 percent in the 1980s alone. Even Los Angeles, the smog capital of the country thanks to its geography and automobile-oriented infrastructure, has enjoyed a 25 percent decline in smogalert days.
In 1960 only about 50 million Americans were served by municipal sewage plants that provided secondary or tertiary treatment. Today more than half the population is. As a result, many urban waterways are now cleaner than they have been since the early 180Os. New York used to dump the sewage of eight million people into the Hudson, Harlem, and East rivers. Today, in a development that would have stunned turn-of-the-century New Yorkers, there is an annual swimming race around Manhattan Island.
Rural rivers too have greatly benefited. Most of the Connecticut River’s four-hundredmile length was declared “suitable only for transportation of sewage and industrial wastes” in the 1960s. Today 125 new or upgraded water treatment plants, costing $900 million, have transformed it. Fishing and swimming are now allowed almost everywhere, and wildlife such as ospreys, bald eagles, blue crabs, and salmon has returned in numbers.
The sludge that is the end product of sewage treatment was until very recently dumped in the ocean or into landfills. Now it is increasingly being sought by farmers as a cheap fertilizer and soil conditioner. New York City produces 385 tons a day, all of it once dumped beyond the continental shelf. One hundred tons of that is being used by farmers in Colorado and Arizona. Initially skeptical, fifty of those farmers recently sent New York’s mayor a letter asking for more. He’s likely to oblige. Boston sludge now fertilizes Florida citrus groves. And because sewage sludge not only fertilizes but improves soil quality, it is displacing chemical fertilizers.
As old factories reach the end of their productive lives and are replaced by new ones built under stringent controls, the non-sewage pollution of the waterways is also steadily declining. The violation rate (the percentage of tests where the amount of pollutants was found to be above standards) for lead and cadmium fell to less than one percent. Dissolved oxygen is an important measure of a water body’s biological viability. The percentage of times it was found to be below standard fell 60 percent in the 1980s.
Many bodies of water, such as Lake Erie, declared dead in the 1970s, have bounded back with the improved situation and with the help of life’s ferocious determination to go on living. The amounts of pesticides being used every year fell by more than a quarter in the 1980s, and those in use today are far less persistent and far less toxic than most of those in widespread use in the 1960s. The level of DDT present in human fatty tissue, a fair measure of its presence in the environment, was 7.95 parts per million in 1970. By 1983 it had fallen to 1.67 parts per million. Today, ten years later, no one even bothers to gather the statistic.
The land, too, has improved. In the eastern part of the United States, the area of forest land has been increasing for more than a century, as clear-cut areas have been allowed to regenerate. It will be another hundred years, at least, before they reach the climax stage, but they are on their way. And today 28 percent of all farmland is no longer plowed at all, and the percentage is growing quickly. Conservation tillage is used instead; the method sharply reduces erosion and improves soil quality while slashing costs, producing crops for as much as 30 percent less.
Programs to reduce the use of chemical fertilizers are being tried in more and more areas as farmers learn new techniques. In Iowa in 1989 and 1990 a joint EPA-state program helped farmers cut their use of nitrogen fertilizer by four hundred million pounds without sacrificing crop yields. Because agricultural fertilizers and pesticides now account for more than 65 percent of all water pollution (factories account for only 7 percent), this trend has no small implication for the future.
Wildlife is on the mend in many ways. To be sure, the number of species on the endangered list has grown sharply in the last two decades, but that is much more an artifact of increased knowledge than of a still-deteriorating situation.