Pesticides: Now More Than Ever
How quickly we forget.
After the publication of âSilent Spring,â 50 years ago, we (scientists, environmental and health advocates, birdwatchers, citizens) managed to curb the use of pesticidesÂ and our exposure to them â only to see their application grow and grow to the point where American agricultureÂ uses more of themÂ than ever before.
And the threat is more acute than ever. While Rachel Carsonfocused on their effect on ânature,â itâs become obvious that farmworkers need protection from direct exposure while applying chemicals to cropsÂ . Less well known are theÂ recentÂ studiesshowing that routine, casual, continuing â what you might call chronic â exposure to pesticides is damaging not only to flora but to all creatures, including the one that habitually considers itself above it all: us.
As usual, there are catalysts for this column; in this case they number three.
I was impressed by aÂ statement by the American Association of PediatricsÂ â not exactly a radical organization â warning parents of the dangers of pesticide and recommending that they try to reduce contact with them. The accompanying report calls the evidence ârobustâ for associations between pesticide exposure and cancer (specifically brain tumors and leukemia) and âadverseâ neurodevelopment, including lowered I.Q., autism, and attention disorders and hyperactivity. (Alzheimerâs, obviously not a pediatric concern, has also been linked to pesticide exposure.)
This reminded me of recently disclosed evidence showing thatpesticide exposure in pregnant women may be obesogenicÂ â that is, it may cause their children to tend to become obese. The mechanism for this is beginning to be understood, and itâs not entirely shocking, because many pesticides have been shown to be endocrine disruptors, changing gene expression patterns and causing unforeseen harm to health.
And that in turn prompted me to recall that genetically engineered crops, ostensibly designed in part toÂ reduceÂ the need for pesticides, have â thanks to pesticide-resistant âsuperweedsâ â actuallyincreased our pesticide useÂ steadily over the last decade or so. (In general, fields growing crops using genetically engineered seeds use 24 percent more chemicals than those grown with conventional seeds.)
Although these all caught my attention, the most striking non-event of the last year â decade, generation â is how asleep at the wheel we have all been regarding pesticides. Because every human testedÂ is found to have pesticidesÂ in his or her body fat. And becausepesticides are foundÂ in nearly every stream in the United States, over 90 percent of wells, and â in urban and agricultural areas â over half the groundwater. SoÂ Department of Agriculture dataÂ show that the average American is exposed to 10 or more pesticides every day, via diet and drinking water.
This shouldnât be surprising:Â pesticide driftÂ is a term used to describe the phenomenon by which almostÂ allÂ pesticides â 95 to 98 percent is the number Iâve seen â wind up on or in something other than their intended target. (This means, of course, that in order to be effective more pesticides must be used than would be necessary if targeting were more accurate.)
Much damage has been done, and itâs going to get worse before it gets better. The long-term solution is to reduce pesticide use, and the ways to do that include some of the typical laundry-list items that find their way into every âhow to improve American agricultureâ story: rotate crops, which reduces attacks by invasive species; employintegrated pest management, which basically means âthink before you sprayâ; better regulate pesticides (and both increase funding for and eliminate the revolving door policy at the Environmental Protection Agency) with an eye toward protecting the most vulnerable â that is, farmworkers, anyone of childbearing age, and especially women in their first trimester of pregnancy
; give farmers options for âconventional,â that is, non-genetically engineered seeds (around 95 percent of all seeds for soy, corn and cotton contain a pesticide-resistant gene, which encourages wanton spraying); and in general move toward using more organic principles.
Note, please, that only this last strategy helps us protect ourselves and our families now. But although thereâs the usual disclaimer that not everyone can afford organic food, at a time when organic food has been under attack itâs important to remember that part of the very reason for its existence is to bring food to the market that, if not free of all traces of pesticides â remember drift â at least contains none that have been applied intentionally. Charles Benbrook, in his excellent 2008 reportÂ âSimplifying the Pesticide Risk Equation: The Organic OptionâÂ estimates that organic food production would reduce our overall exposure to pesticides by 97 percent; that is, all but eliminate it.
If I were of child-rearing age now, or the parent of young children, I would make every effort to buy organic food. If I couldnât do that, I would rely on the Environmental Working GroupâsÂ guide to pesticides in produce. (Their âDirty Dozenâ lists those fruits and vegetables with highest pesticide residues, and their âClean Fifteenâ notes those that are lowest.) But regardless of age, we need to stay awake, and remember that the dangers of pesticides are as real now as they were half a century ago.