Support Grist
Support nonprofit, independent environmental journalism.
Donate to Grist.
Victual Reality

Chemically Dependent

Decades after Silent Spring, pesticides remain a menace -- especially to farmworkers

By Tom Philpott
18 Oct 2006
Tools: print | email | discuss | write to the editor | subscribe | RSS
In 1962, Rachel Carson published her landmark Silent Spring, which documented the ravages of agricultural pesticides, particularly DDT, on wildlife. The book inspired wide outrage and helped spark the modern environmental movement. It eventually led to a (now-controversial) ban on DDT. But since then, use of other pesticides has boomed.

Sign of the times?
Sign of the times?
Photos: iStockphoto
According to a USDA report, between 1964 and 1982, pesticide use in the U.S. jumped by a factor of almost three, peaking at nearly 600 million pounds annually. The USDA is shockingly casual about releasing current pesticide statistics. The freshest data I can find show pesticide use hovering at 500 million pounds in 2002 -- more than double the 1964 level.

This annual avalanche of toxins onto our crops and soils has been accompanied by mounting evidence of their ill effects on public health -- particularly that of farmers and farmworkers. The latest entry: a study from Canada showing that women who had worked on farms were nearly three times as likely as other women to develop breast cancer.

The Agricultural Health Study, a joint venture of several public-health agencies, has revealed direct links between chemical-intensive farming and both prostate cancer and retinal degeneration. A link has also been established between pesticide use and Parkinson's disease.

Shifting the Burden


If Carson's book had a limited effect on the rising tide of pesticide use, it probably did affect the types of agricultural poisons used.

In 1990's The Death of Ramon Gonzales: A Modern Agricultural Dilemma, Angus Wright argued that Silent Spring sparked a backlash against so-called "persistent" pesticides, which build up over time in soil, groundwater, and the bodies of animals. These dangerous chemicals also tend to cling in residue form to fruits and vegetables in the supermarket.

The agrichemical industry's response -- embraced by farm owners, government regulators, and global aid institutions -- was to promote pesticides that break down rapidly. But these alternatives, known as "non-persistent" chemicals, are much more dangerous at the time of application. The strategy, Wright says, was to placate public fear about pesticide poisoning by shifting as much of the risk as possible onto farm ecosystems and farmworkers, and away from consumers and the broader environment.

The shift occurred later in Mexico and other developing nations than in the U.S., Wright shows. That's because the chemical industry's first reaction to U.S. public anger about DDT and other "persistents" was to shut them out of the U.S. market and push them on farmers in the global south, which had weaker regulatory regimes. But muckraking journalists exposed a "circle of poison": chemicals that had been banned in the United States were reappearing in U.S. supermarkets heavily stocked, particularly in winter, with Mexican fruit and vegetables.

Farm at your own risk.
Farm at your own risk.
As a result of public outcry, use of the quicker-to-break-down but highly toxic non-persistent chemicals then exploded in the global south, particularly in areas characterized by export-oriented farming. This early-1980s switch had "immediate and tragic consequences for farmworkers," according to Wright. Despite strong industry-backed standards requiring that anyone handling such poisons be protected by respirators, rubber coveralls, and other gear, Wright observed such requirements being routinely violated by large, export-minded landowners.

Such violations remain routine -- and not just in Mexico. A 2002 report [PDF] spearheaded by the Pesticide Action Network summarizes findings from California's Department of Pesticide Regulation. The agency surveyed a sampling of pesticide-reliant farm operations between 1997 and 2001. Fully one-third violated regulations involving protective equipment, washing facilities, and fieldworker access to pesticide use information. The agency claimed that 88 percent of the protective-equipment violations stemmed from employer negligence.

In The Same Vein
Do You See What I See?
Photographer Laurie Tümer shows the hidden paths of pesticides
In Death, Wright traces the fate of one young farmworker who died in 1981, most likely from exposure to a class of non-persistent insecticides known as organophosphates. Many products from this pesticide class -- which came upon the world stage as a nerve gas developed by German engineers during World War II -- remain legal in the United States. Two months ago, after contemplating the matter for 10 years, the U.S. EPA approved use of 32 organophosphates -- a decision so egregious that it prompted a public outcry from hundreds of agency scientists who claimed their leaders had been swayed by industry influence.

Like the oil industry, agribusiness survives on its ability to privatize profits and socialize costs. Heavy pesticide use helped bring about short-term gains in crop yields, which has meant billions in profits for grain traders, food processors, agrichemical giants, and other food-related multinational corporations. To these firms, pesticide-related deaths and maladies are what economists call an "externality" -- a cost that lands in someone else's ledger.

That the burden has been engineered to fall most heavily on farmworkers -- a group not known for its access to high-level health care -- is particularly galling.

Farmworker health has quietly become a kind of human sacrifice at the altar of cheap food. Consumers in the U.S. benefit from -- and low-income people rely on -- the world's cheapest food system. They owe it to farmworkers to demand an end to, or at least a severe reduction in, pesticide use. Consumer hell-raising helped ban DDT and other persistent pesticides in the 1970s. More than 40 years after the publication of Silent Spring, it's time to finish the job.

Tools: print | email | discuss | write to the editor | subscribe | RSS

Got a question about where your last supper came from?

Grist contributing writer Tom Philpott farms and cooks at Maverick Farms, a sustainable-agriculture nonprofit and small farm in the Blue Ridge Mountains of North Carolina.
< Previous | Next >
Comments: (7 comments)

You are not logged in. Thus, you cannot post a comment. If you have a Gristmill account, log in below. If you don't have a Gristmill account, well, by all means go make one! Meet you back here in five.

Username: Password:

Forgot your password? Enter your username and click:

GMOs again... I can't resist.

This is why I keep going on about the need for GMO and Organic people to get together and discuss whether there might be an acceptable way to combine the two approaches to reduce or eliminate chemical inputs, improve the grower's bottom line, and protect the health of workers, consumers, and the environment.

Consider the following three chemicals used for controlling late blight infecting potatoes: Maneb, Mancozeb, and Chlorothalonil. All three are recognized carcinogens and each is suspected of three or  five of the following: Developmental Toxicant, Endocrine Toxicant, Immunotoxicant, Neurotoxicant, Reproductive Toxicant, Skin or Sense Organ Toxicant, or Respiratory Toxicant. Information from http://www.scorecard.org/index.tcl (a pollution information site).

A list of other chemicals used for controlling late blight can be found at
http://www.uidaho.edu/ag/plantdisease/plbclst.htm. Please look up a few of those at the pollution information site.

I would prefer to consume a GMO potato over those treated with fungicides. I would prefer to live next to a GMO potato field. I would prefer not dumping fungicides into our water supply. I would prefer not to poison the people growing food. GMOs can help us solve many problems. They are not the ultimate solution. And any technology can be abused. But they are not entirely evil either.

Is there any common ground between GMO and organic people? Can they work together to reduce pollution and improve human and environmental health?


Sorry but . . . (I can't resist either)

GMOs have not significantly increased yields, nor have they significantly decreased the amount of pesticides. In fact, as I stated in another discussion, Round-up ready GMO crops are engineered to specifically to withstand being treated with this pesticide. Genetic engineering takes genes from totally unrelated species and forces them into corn or potatoes or rice or wheat or whatever. It's a violent process with consequences yet to be discovered. We already know how to farm, how to feed people, how to reduce pollution. We just don't do it. We don't need to screw around with an organism's basic DNA in order to feed people. We've become so used to corporate style agriculture it's hard to imagine another kind, but I have to believe that if only a fraction of the money being spent on biotech was spent on building soil, teaching more people to farm, stopping the development of farm land we could feed people and help the Earth.

The technology itself is not evil.

SMLowry writes...

"In fact, as I stated in another discussion, Round-up ready GMO crops are engineered to specifically to withstand being treated with this pesticide."

I pointed out that the technology can be abused. I am not comfortable with Round-Up Ready crops because they demand additional inputs. I'm interested in GMOs that reduce chemical use. The example I present allows a farmer to avoid using fungicides. Even the copper compounds approved for organic crops are hazardous. I tried to find information demonstrating that potatoes can be grown organically, using relatively resistant varieties, using the copper compounds, and not using GMOs, but control of late blight is not possible and yields are substantial reduced. To me, a GMO that permits growing more food on less land without chemicals is better than expanding the area cultivated land, especially in developing countries, at the expense of natural ecosystems.

SM Lowry also writes...

"Genetic engineering takes genes from totally unrelated species and forces them into corn or potatoes or rice or wheat or whatever."

The GMO in question is a potato containing a gene that confers resistance to late blight. The gene was isolated from a related wild plant in the Solanum genus. We are not putting a fish gene in a plants. The gene could be moved into cultivated varieties through semi-convential breeding, but the complexity of the potato genome makes this extremely difficult and still maintain desirable traits. It would be much more efficient to put the gene directly into the cultivars preferred in Mexico, cultivars prefrred in India, cultivars preferred in Europe. We are not creating a new monculture for the globe, but modifying potato varieties already adapted for specific cultures and climates.

Regarding...

"We already know how to farm, how to feed people, how to reduce pollution. We just don't do it. We don't need to screw around with an organism's basic DNA in order to feed people."

We could have said this at the dawn of agriculture, but we have modified most of our food organisms to the point where they would never survive long in the wild. And we continue to modify our farming practices to feed more people and reduce pollution. We substantially "screwed around" with the basic DNA of many organisms before even knowing what a gene is just so we could feed people.

And...

"We've become so used to corporate style agriculture it's hard to imagine another kind..."

GMOs can be used by the smallest farms. I propose fighting corporate domination over the technology, not the technology iteslf. I am not an apologist for the corporations.

autism, pesticides, other environmental factors

Mainstream press articles about autism often mention the "mystery" of autism. However, several peer-reviewed articles make clear that environmental pollutants are etiologically significant in many cases. RF Palmer and colleagues found that "On average, for each 1,000 lb of environmentally released mercury, there was a 43% increase in the rate of special education services and a 61% increase in the rate of autism." (1). Similarly, Windham et al state that "Our results suggest a potential association between autism and estimated metal concentrations, and possibly solvents, in ambient air around the birth residence, requiring confirmation and more refined exposure assessment in future studies." (2). Additional support for the role of environmental toxins is provided by D'Amelio and colleagues (2005), who describe associations among autism, organophosphate pesticide exposure, and weak alleles of a gene whose enzyme participates in detoxification (3).

The context of these findings is that more than 20 studies have documented a large number of intra-body toxins in humans. Those findings will be presented elsewhere in these webpages.

Teresa Binstock
Researcher in Developmental & Behavioral Neuroanatomy

References (two available free online):

1: http://www.seedcoalition.org/downloads/autism_study_UTHSC...

Palmer RF, Blanchard S, Stein Z, Mandell D, Miller C. Environmental mercury release, special education rates, and autism disorder: an ecological study of Texas. Health Place. 2006 Jun;12(2):203-9.

University of Texas Health Science Center, San Antonio Department of Family and Community Medicine, 7703 Floyd Curl Drive, San Antonio, Texas 78229-3900, USA. palmer@uthscsa.edu

The association between environmentally released mercury, special education and autism rates in Texas was investigated using data from the Texas Education Department and the United States Environmental Protection Agency. A Poisson regression analysis adjusted for school district population size, economic and demographic factors was used. There was a significant increase in the rates of special education students and autism rates associated with increases in environmentally released mercury. On average, for each 1,000 lb of environmentally released mercury, there was a 43% increase in the rate of special education services and a 61% increase in the rate of autism. The association between environmentally released mercury and special education rates were fully mediated by increased autism rates. This ecological study suggests the need for further research regarding the association between environmentally released mercury and developmental disorders such as autism. These results have implications for policy planning and cost analysis.
PMID: 16338635

2. http://www.ehponline.org/members/2006/9120/9120.html

Windham GC et al. Autism spectrum disorders in relation to distribution of hazardous air pollutants in the san francisco bay area. Environ Health Perspect. 2006 Sep;114(9):1438-44.

Division of Environmental and Occupational Disease Control, California Department of Health Services, Richmond, California, USA. gwindham@dhs.ca.gov

OBJECTIVE: To explore possible associations between autism spectrum disorders (ASD) and environmental exposures, we linked the California autism surveillance system to estimated hazardous air pollutant (HAP) concentrations compiled by the U.S. Environmental Protection Agency. METHODS: Subjects included 284 children with ASD and 657 controls, born in 1994 in the San Francisco Bay area. We assigned exposure level by census tract of birth residence for 19 chemicals we identified as potential neurotoxicants, developmental toxicants, and/or endocrine disruptors from the 1996 HAPs database. Because concentrations of many of these were highly correlated, we combined the chemicals into mechanistic and structural groups, calculating summary index scores. We calculated ASD risk in the upper quartiles of these group scores or individual chemical concentrations compared with below the median, adjusting for demographic factors. RESULTS: The adjusted odds ratios (AORs) were elevated by 50% in the top quartile of chlorinated solvents and heavy metals [95% confidence intervals (CIs) , 1.1-2.1], but not for aromatic solvents. Adjusting for these three groups simultaneously led to decreased risks for the solvents and increased risk for metals (AORs for metals: fourth quartile = 1.7 ; 95% CI, 1.0-3.0 ; third quartile = 1.95 ; 95% CI, 1.2-3.1) . The individual compounds that contributed most to these associations included mercury, cadmium, nickel, trichloroethylene, and vinyl chloride. CONCLUSIONS: Our results suggest a potential association between autism and estimated metal concentrations, and possibly solvents, in ambient air around the birth residence, requiring confirmation and more refined exposure assessment in future studies.
PMID: 16966102

3. D'Amelio M et al. Paraoxonase gene variants are associated with autism in North America, but not in Italy: possible regional specificity in gene-environment interactions. Mol Psychiatry. 2005 Nov;10(11):1006-16.

Laboratory of Molecular Psychiatry and Neurogenetics, University Campus Bio-Medico, Rome, Italy.

Organophosphates (OPs) are routinely used as pesticides in agriculture and as insecticides within the household. Our prior work on Reelin and APOE delineated a gene-environment interactive model of autism pathogenesis, whereby genetically vulnerable individuals prenatally exposed to OPs during critical periods in neurodevelopment could undergo altered neuronal migration, resulting in an autistic syndrome. Since household use of OPs is far greater in the USA than in Italy, this model was predicted to hold validity in North America, but not in Europe. Here, we indirectly test this hypothesis by assessing linkage/association between autism and variants of the paraoxonase gene (PON1) encoding paraoxonase, the enzyme responsible for OP detoxification. Three functional single nucleotide polymorphisms, PON1 C-108T, L55M, and Q192R, were assessed in 177 Italian and 107 Caucasian-American complete trios with primary autistic probands. As predicted, Caucasian-American and not Italian families display a significant association between autism and PON1 variants less active in vitro on the OP diazinon (R192), according to case-control contrasts (Q192R: chi2=6.33, 1 df, P<0.025), transmission/disequilibrium tests (Q192R: TDT chi2=5.26, 1 df, P<0.025), family-based association tests (Q192R and L55M: FBAT Z=2.291 and 2.435 respectively, P<0.025), and haplotype-based association tests (L55/R192: HBAT Z=2.430, P<0.025). These results are consistent with our model and provide further support for the hypothesis that concurrent genetic vulnerability and environmental OP exposure may possibly contribute to autism pathogenesis in a sizable subgroup of North American individuals.
PMID: 16027737

DDT: The first and the best


If the Libs hadn't ruined our ability to use DDT, we wouldn't have lost 10s of millions of starving and diseased Africans.

By all means, Jabailo...

...show us the way forward and fumigate your own house with that miracle stuff. I will be training my eye on both the DDT ban and the false promises of GMOs in future columns.
P.S. Thanks Theresa Binstock for an informative post.

Victual Reality
Somehow,

I don't think that Jabailo gives a shit about the tens of millions of starved and diseased Africans. Call it a hunch...

You are not logged in. Thus, you cannot post a comment. If you have a Gristmill account, log in below. If you don't have a Gristmill account, well, by all means go make one! Meet you back here in five.

Username: Password:

Forgot your password? Enter your username and click:

The comments of Grist users reflect the opinions of those individuals only, and do not necessarily reflect the viewpoints of Grist, its staff, its board members, their psychotherapists, or their aestheticians. Got it?


Also in Grist

The Week's Most Popular
From the Archives
Roughage Riders, by Tom Philpott. Senators threaten to impose industrial-strength rules on small vegetable farms.
Heat and Serve, by Tom Philpott. Can industrial agriculture withstand climate change?
The Revolution Will Be Criticized, by Tom Philpott. Why the new "Green Revolution" in Africa may be misguided.

ADVERTISING POLICY


About Grist | Support Grist | Jobs Board | Archives | Grist by Email | RSS | Podcasts
Gristmill Blog | In the News | Ask Umbra® | Muckraker | Victual Reality | 'Tis the Season | The Grist List | The Bottom Line



Grist: Environmental News and Commentary
a beacon in the smog (tm) ©2007. Grist Magazine, Inc. All rights reserved. Gloom and doom with a sense of humor®.
Webmaster | Privacy Policy | Terms of Service | Trademarks