(Beyond Pesticides, April 4, 2019) Contamination of drinking water with toxic breakdown products and risks to fish and and amphibians has led to a ban on the fungicide chlorothalonil in the European Union (EU). While the pesticide will be out of use in the EU next decade, tens of millions of pounds will continue to be sprayed throughout the U.S. unless regulators take action quickly. “The [chlorothalonil ban] is based on [the European Food Safety Authority’s] EFSA’s scientific assessment which concluded that the approval criteria do not seem to be satisfied for a wide range of reasons,” a spokeswoman for the European Commission told The Guardian. “Great concerns are raised in relation to contamination of groundwater by metabolites of the substance.” EFSA’s review of chlorothalonil categorized it as a 1B carcinogen, meaning it “may cause cancer,” with the most significant risk found for kidney cancer based on laboratory animal studies. Further research was needed into many of the metabolites (break-down substances) created when chlorothalonil degrades. However, regulators determined enough data was present to conclude that these breakdown substances may be genotoxic, with the potential to damage DNA and lead to cancer. European regulators also identified a high acute risk to […]

(Beyond Pesticides, April 4, 2019)  Following on its verdict that the herbicide Roundup caused plaintiff Edwin Hardeman’s  non-Hodgkin lymphoma (NHL), the jury on March 27 issued an award of $80 million—$5 million in compensatory damages and $75 million in punitive damages—for improper labeling and negligence on the part of the manufacturer and defendant, Monsanto. The trial, the first federal Roundup cancer trial, marks the first of a multidistrict litigation against Monsanto, with more than 1,600 similar lawsuits pending in San Francisco’s federal court. The jury’s second verdict affirmed Mr. Hardeman’s allegations that Roundup’s design is defective and lacks sufficient warnings, and that Monsanto was negligent by not using reasonable care to warn about Roundup’s NHL risk. The Edwin Hardeman v. Monsanto Co. jury verdict marks the second multi-million dollar award to be granted in a landmark case against Bayer/Monsanto within the past year. Last August in San Francisco Superior Court, California groundskeeper Dewayne “Lee” Johnson was awarded $39 million in compensatory damages, and $250 million in punitive damages in the first case that linked his NHL to Monsanto’s glyphosate/Roundup. In October, the judge in the case upheld the verdict, but reduced the award to $78 million. Mr. Hardeman is represented by […]

(Beyond Pesticides, April 2, 2019) The new documentary film “Ground War” will have its New York City premiere screening on Saturday, April 6, 2019, 7:30pm at Florence Gould Hall, 55 East 59th Street, New York, NY. The film is a moving depiction of a son’s quest for answers about the cause of his father’s cancer—which takes him into the world of doctors, scientists, pesticide regulators, victims of pesticide poisoning, activists, and land managers. The issue is exposure to pesticides used to manage lawns and playing fields and the father’s exposure as an avid golfer. The son, who is the filmmaker, finds others on the same search for answers because of harm or death of a loved one, then finds a solution in the work of activists and organic land managers. The film is particularly timely with public controversy about the use of the weed killer glyphosate (Roundup) and two lawsuits with multimillion dollar jury verdicts for compensation and punitive damages against its manufacturer, Monsanto (Bayer)—while thousands of lawsuits are pending. All of this widespread pesticide exposure is taking place in the face of inaction by the U.S. Environmental Protection Agency and headlines pointing to officials sidestepping the law. The film screening […]

(Beyond Pesticides, March 29, 2019) The U.S. Environmental Protection Agency (EPA) made a low-key announcement on March 19 suggesting that it may change its handling of requests from states to exert stricter controls on use of pesticides than the federal agency sets out in its registration of the compounds — by disapproving them. This is potentially a big deal because it signals that the agency will be less-kindly disposed to states’ desires to establish either somewhat different parameters of use based on local conditions and needs, or more-stringent regulations on pesticide use than those set out by federal regulators. This issue of preemption of localities’ desires to protect their populations and environment has become an increasingly dynamic frontier at the nexus of pesticide use, health, and environment. Beyond Pesticides has written more frequently about this issue in recent years as the tension between centralized, federal regulation and more-local regulation has risen; see more below. EPA appears distressed by some of the approximately 300 annual requests it gets to make some adjustment to the federal regulation. This can happen under Section 24(c) of FIFRA, which allows for a Special Local Need Label, which can be requested under a variety of conditions, including […]

(Beyond Pesticides, March 27, 2019) Exposure to commonly used pesticides in the womb and during the first year of life is linked to a higher risk of developing autism, according to the study, “Prenatal and infant exposure to ambient pesticides and autism spectrum disorder in children: population based case-control study,” published in the journal BMJ last week. Although the study does not reveal a causal link, it adds to previous literature highlighting autism risks from pesticide exposure, and reinforces calls to limit pesticide exposure during early life critical windows of vulnerability. The authors note their findings “support the need to avoid prenatal and infant exposure to pesticides to protect the developing child’s brain.” Researchers used data from California’s records of autism disorder diagnosis and birth rates from 1998 to 2010. Roughly thirty-five thousand healthy patients acted as a control, while scientists identified nearly three thousand patients with an autism diagnosis, of which 445 also displayed a co-occurring intellectual disability. Data was then drawn from California’s pesticide use recording database, and eleven pesticides (glyphosate, chlorpyrifos, diazinon, acephate, malathion, permethrin, bifenthrin, methyl bromide, imidacloprid, avermectin, and myclobutanil) were analyzed for their use within 2000 meters (1.25 miles) of the homes of those […]

(Beyond Pesticides, March 26, 2019) In a study investigating the carcinogenic effects of pesticide exposure by analyzing data on 316,270 farmers and farmworkers in the U.S., Norway, and France, researchers have identified elevated risk for non Hodgkin lymphoma (NHL) and some subtypes, linking glyphosate and large B-cell lymphoma. Other pesticides linked to the disease include the pyrethroid deltamethrin and chronic lymphocytic leukemia/small lymphocytic lymphoma; and terbufos and NHL overall. Researchers also found “inverse associations of NHL overall with the broader groups of organochlorine insecticides and phenoxy herbicides, after adjusting for exposure to other pesticides”; such inverse associations were not found with active ingredients within these groups. The research underscores how complex the science of pesticide impacts on human health, and on cancer incidence, can be. To wit: in evaluating 14 different pesticide categories and 33 individual, active chemical ingredients, Maria E. Leon, et al., conclude that associations of pesticides with the development of NHL appear to be (NHL) subtype- and chemical-specific. Published in the International Journal of Epidemiology in mid-March, the study, “Pesticide use and risk of non-Hodgkin lymphoid malignancies in agricultural cohorts from France, Norway and the USA: a pooled analysis from the AGRICOH consortium,” uses data from three large cohort […]

(Beyond Pesticides, March 20, 2019) In a second verdict against Bayer/Monsanto yesterday, a jury found unanimously that a California man’s non Hodgkin lymphoma (NHL) was substantially caused by the herbicide glyphosate (Roundup). The case being heard in federal court in San Francisco now moves to the damages phase. Last August in San Francisco Superior Court, a California groundskeeper was awarded $39 million in compensatory damages, and $250 million in punitive damages in a case that linked his NHL to Monsanto’s glyphosate/Roundup. In October, the judge in the case upheld the verdict, but reduced the award to $78 million. According to the Associated Press, the trial judge, U.S. Judge Vince Chhabira “is overseeing hundreds of Roundup lawsuits and has deemed [this case] and two others ‘bellwether trials.“ The case was brought by Edwin Hardeman of Santa Rosa, CA. He said he had been using Roundup since the 1980’s. During the trial, according to The Guardian, Judge Chhabria, “approved Monsanto’s request to prohibit Hardeman’s attorneys from raising allegations about the corporation’s conduct, saying issues about its influence on science and government were a ‘significant … distraction.’” This set up a limitation that required the plaintiff’s attorneys to focus solely on studies linking the chemical to cancer […]

(Beyond Pesticides, March 17, 2019) Forget about single-pesticide issues: this affects every single one of them. EPA is allowing massive data gaps to persist for each and every pesticide product it registers by conducting the bulk of its health and environmental risk assessments using active ingredients alone. With its current practices, EPA is failing its federal mandate to protect public health and the environment and misleading the public about what is “safe.” Tell your Congressional delegation that EPA must assess the real risks of pesticide use, not rely on false representations of risk based on tests of isolated ingredients. When pesticides are sprayed on our crops, lawns, and roadsides, and enter into our waterways, groundwater and drinking water, we are exposed to whole formulations, whole tank mixtures, and whole pesticide combinations, not just active ingredients (those that the manufacturer claims are the only ingredients that attack the target pest). It is the whole formulation that makes the poison, and that whole formulation must be regulated. Active ingredients are far from the whole story of pesticide poisoning. Despite their name, “inert” ingredients are very often not chemically, biologically, nor toxicologically inert or innocuous. According to a peer-reviewed study, as of 2006, more […]

(Beyond Pesticides, March 15, 2019) Beyond Pesticides and others have worked for many years to educate stakeholders and policy makers about the dangers of pesticides, and to transform pest management by eliminating a reliance on toxic pesticides and advancing organic management practices. Considerable focus has been on glyphosate, which is used in several herbicides, most notably in Bayer’s (then Monsanto’s, until its 2018 purchase by Bayer) Roundup. The compound has had a relatively high profile in the pesticide landscape, due in part to the ubiquity of its use, and in part to the tireless work of health and environmental advocates and scientists to expose its risks. With that profile, glyphosate has been a bit of a stand-in for the dangers of pesticides broadly. As journalist Carey Gillam said at Beyond Pesticides’ 36th National Pesticide Forum in 2018, “Glyphosate is the poster child for the bigger pesticide problem. . . . If it goes away tomorrow, we are [still] not okay.” The variety of risks this compound poses is broad, and pushback and risk evidence on its use come from multiple sides. This Daily News Blog focuses on recent developments on several of those fronts, all of which advanced knowledge and momentum, […]

(Beyond Pesticides, March 14, 2019) A study, supported by the USDA’s National Institute of Food and Agriculture, finds that state pesticide preemption laws “compromise public health and economic well-being” by preventing localities from enacting pesticide use restrictions on private property that are more restrictive than their state’s regulations. In the words of the authors, “By eliminating the ability of local governments to enact ordinances to safeguard inhabitants from health risks posed by pesticides, state preemption laws denigrate public health protections.” The study, Anti-community state pesticide preemption laws prevent local governments from protecting people from harm, published in the International Journal of Agricultural Sustainability, reviews scientific and historical evidence of the failure of state and federal pesticide laws to protect localities from pesticide poisoning, and highlights the inability of localities to compensate for that failure under present laws. Communities seeking to protect their residents would typically issue community-wide restrictions to ensure protection of shared community resources, including air, land, and waterways, from pesticide drift, runoff, and other nontarget effects —as is the case with other community decisions on recycling, smoking, and zoning. The study’s authors document how industry influence led to the adoption of state laws that undermine the ability of localities […]

(Beyond Pesticides, March 6, 2019) After a brief hiatus, Florida Fish and Wildlife Conservation Commission (FWC) is continuing use of aquatic herbicides, including glyphosate, for invasive species management. Public pressure and feedback caused FWC to take a temporary pause from spraying while the commission collected public comment  through public hearings and emails from late January through February. FWC ultimately decided to resume spraying invasive species, and points to its improved integrated management system as reducing overall herbicide use. Glyphosate, one of the 17 aquatic herbicides that FWC uses regularly has sparked opposition from environmentalists and the general public due to its wide usage and known adverse effects. According to FWC data, 12,263 pounds of glyphosate-based herbicides were used on Florida’s Lake Okeechobee in 2017. About 175,000 people have signed North Palm Beach photographer and wildlife advocate Jim Abernathy’s petition titled “Stop The State-Sanctioned Poisoning of Our Lakes and Rivers!”. The petition decries the use of glyphosate to kill invasive aquatic plants and warns of subsequent nutrient pollution caused by decay. An excess of nutrients (e.g. nitrogen and phosphorus) in water bodies contribute to algal blooms. Eutrophication can eventually result in oxygen depletion and thereby decrease biodiversity. FWC denies that the […]

(Beyond Pesticides, March 5, 2019) Wild, edible plants subject to drift from the herbicide glyphosate during forestry operations can be contaminated with the chemical an entire year after an initial application, according to a new study published in the Canadian Journal of Forest Research. Glyphosate is often used in forestry to knock down unwanted trees, shrubs, and other plants after clear-cutting to provide room for the regrowth of trees deemed valuable. However, this new research shows that “non-target” species, such as raspberries and blueberries, eaten by wildlife and sometimes wild foraged by humans can retain significant levels of glyphosate contamination due to drift and overspray. Forester Lisa Wood, PhD, from the University of Northern British Columbia began this research based on input and requests from Canadian indigenous First Nations communities. Back in 2013, shrubs foraged by traditional berry-pickers in northeastern British Columbia were sampled and found to contain glyphosate residues, leading to the need for a broader investigation. Dr. Wood sampled the roots and shoots of 10 plant species from an area that had been aerially sprayed with glyphosate a year prior as part of forestry operations to clear aspen and make room for coniferous re-plantings. The 10 plants, which […]

(Beyond Pesticides, February 28, 2019) Earlier this month, a team of U.S. scientists published a meta-analysis of studies on glyphosate-based herbicides (GBH), concluding that the evidence “suggests a compelling link between exposures to GBH and increased risk of NHL [non-Hodgkin lymphoma],” corroborating findings by the International Agency for Research on Cancer. The analysis, authored by researchers from University of California, Berkeley, University of Washington, Seattle, and the Icahn School of Medicine at Mount Sinai, New York, is the latest to support the conclusions established by the International Agency for Research on Cancer that products containing glyphosate pose a cancer risk to humans. As research continues to accumulate on the risks posed by this chemical, the case for transitioning to less toxic alternatives to safeguard public health is becoming increasingly urgent. Researchers took every available published human study on NHL and glyphosate, including the most recently updated data from the ongoing U.S. Agricultural Health Study (AHS), in conducting their review. Focus was put on individuals within these studies exposed to the highest amounts of glyphosate. The reasoning, researchers indicate, is that if there is a true association between glyphosate and a health outcome like cancer, exposures to higher amounts for a longer […]

(Beyond Pesticides, February 27, 2019) U.S. PIRG tested 20 common beers and wines and found glyphosate residues in all but one. Glyphosate, the active ingredient in Roundup, is the most commonly used agrichemical in the world. Though it is linked to many health and environmental issues, there is no current EPA limit for glyphosate residues in beer or wine. The U.S. Department of Agriculture (USDA) does not regularly test for glyphosate on either food or beverages. Researchers used an enzyme linked immunosorbent assay (ELISA) to detect glyphosate levels. Sutter Home Merlot had the highest level of glyphosate residues at 51 ppb (parts per billion). Barefoot Cabernet Sauvignon and Beringer Estates Moscato had slightly lower levels: 36.3 ppb and 42.6 ppb, respectively. Organic wines results were ~5 ppb. The beer samples had just slightly lower average levels of residues, the highest being Tsingtao beer with 49 ppb. Miller Lite, Corona, and Budweiser ranged from 25-30 ppb. Samuel Smith’s Organic Lager had a 5.7 ppb glyphosate concentration, and Peak Beer Organic IPA was the only sample with no detectable level of glyphosate. By U.S. Geological Survey (USGS) estimates, nearly 300 million pounds of glyphosate are annually applied to U.S. crops. Vineyards spray […]

(Beyond Pesticides, February 26, 2019) Breakfast cereal, apples, applesauce and pinto beans made and sold by Kroger contain residues of toxic pesticides linked to a range of series health and environmental problems, according to a residue study by Friends of the Earth. This is alarming. Kid-friendly food like applesauce and Cheerios should not contain dangerous pesticides. Kids are the most vulnerable to these pesticides and shouldn’t be exposed to brain-damaging or cancer-causing pesticides when they eat their breakfast or snacks. The connection between pesticides and cancer, learning disabilities, and other diseases is supported by hundreds of studies in Beyond Pesticides’ Pesticide-Induced Diseases Database. These new tests, which corroborate numerous residue studies, mean that Kroger customers may be purchasing food with the intent of providing safe and healthy food for their families, but end up unknowingly exposing them to toxic pesticides. Join the national week of action by either delivering a letter to Kroger in person, or sending an email to Kroger Chief Executive Rodney McMullen. The pesticides found in Kroger’s food are harmful to human health and pollinators. Friends of the Earth found residues of cancer-causing glyphosate, brain-damaging organophosphates, and bee-killing neonicotinoid pesticides. Organophosphates can cause damage to children’s developing brains, including reduced IQ, loss […]

(Beyond Pesticides, February 20, 2019) Women exposed to DDT during ‘early windows of susceptibility’ in their childhood are at increased risk of developing breast cancer, according to new research published in the Journal of the National Cancer Institute. Nearly 75 years after the chemical was first used in the U.S., and 50 years after its ban, DDT is continuing to adversely affect the health of Americans. The data brings needed attention to the dangers of early-life pesticide exposure, and underlines the need to take a precautionary approach to the introduction of biocides in our environment so that future generations do not suffer from the same mistakes of the past. “What we have learned is that timing really matters. We know that if harmful exposures occur at times when breast tissue is rapidly changing, such as during puberty, they impact breast development in ways that can later result in cancer,” said lead author Barbara A. Cohn, PhD, of the Public Health Institute’s (PHI) Child Health and Development Studies. “The research published today suggests that DDT affects breast cancer as an endocrine disruptor, that the period of time between first exposure and cancer risk seems to be around 40 years–and that other […]

(Beyond Pesticides, February 13, 2019) Friends of the Earth (FOE) released a report last week again showing pesticide residues in the food supply. The report, Toxic Secret, found store and name brand foods produced and sold by the top four U.S. food retailers — Kroger (NYSE:KR), Walmart (NYSE: WMT), Costco (NYSE:COST) and Albertsons — contain residues of toxic pesticides linked to a range of serious health and environmental problems. Among the pesticides found is the herbicide glyphosate, confirming residue testing results found in numerous studies. Glyphosate, the active ingredient in Roundup, has has been detected in popular foods, including “100% pure” honey, Doritos, Oreos, Goldfish, Ritz Crackers, German beers, California wines, and UK bread. Glyphosate has been ranked as potentially cancer causing in humans and adversely affects the human gut microbiome. See Residue Testing Find More Glyphosate in Popular Cereals. The FOE study finds that oat cereals, apples, applesauce, spinach and pinto beans at the retailers contained detectable amounts of glyphosate, organophosphates and neonicotinoids. The average level of glyphosate found in cereal samples (360 parts per billion) was more than twice the level set by scientists at Environmental Working Group for lifetime cancer risk for children. The average level of glyphosate found in pinto beans (509 ppb) was more […]

(Beyond Pesticides, February 6, 2019) The American Association for the Advancement of Science (AAAS) has awarded two researchers the group’s Scientific Freedom and Responsibility Award for their work uncovering the link between glyphosate and chronic kidney disease (CKD), which has killed at least 25,000 Sri Lankans and 20,000 Central Americans. Award recipients Sarath Guanatilake, MD, and Channa Jayasumana, PhD, faced death threats and claims of research misconduct as they went toe to toe with agrichemical industry giant Monsanto (now Bayer’s Monsanto), the major manufacturer of glyphosate-based products like Roundup. “To right a wrong when significant financial interests are at stake and the power imbalance between industry and individual is at play takes the unique combination of scientific rigor, professional persistence and acceptance of personal risk demonstrated by the two scientists recognized by this year’s award,” says Jessica Wyndham, director of the Scientific Responsibility, Human Rights and Law Program at AAAS. In the mid-90s, reports began to emerge of Sri Lankan rice farmers – many otherwise healthy, young adults, succumbing to CKD. Dr. Gunatilake, a researcher at California State University, Long Beach (CSULB), was hired by the Sri Lanka Ministry of Health to investigate the cause of the disease. Around the […]

(Beyond Pesticides, February 5, 2019) Linuron, an herbicide registered for use by the U.S. Environmental Protection Agency (EPA), yet recently banned in Europe due to health concerns, appears to trigger inflammatory signals that have been linked to the onset of Multiple Sclerosis (MS). This new evidence, published in the journal Cell by researchers at Brigham and Women’s Hospital in Boston, MA, indicates that exposure to chemicals and pesticides in the environment may be a risk factor in the development of neurodegenerative diseases. “We created a platform to systematically investigate the understudied effects of environmental exposures,” said study coauthor Francisco Quintana, PhD. “The goal of our work is to return results that can guide future epidemiological studies and identify actionable targets.” Researchers began their investigation with 976 chemicals identified by EPA’s ToxCast program, an inventory of compounds that have undergone screening for a battery of laboratory tests. Within that inventory, 75 chemicals, including linuron, were found to interfere with the signaling pathways linked to MS. To confirm the adverse impacts, scientists used the embryos of zebrafish, animals often used as models in laboratory research. The zebrafish embryos were altered to contain low levels of myelin, a protein that protects nerve cells, as […]

(Beyond Pesticides, February 1, 2019) Prior to a pesticide ban taking effect in Montgomery County Maryland Parks, the Department of Parks announced in mid-December 2018 that it would discontinue the use of glyphosate-based herbicides through March 2019. The agency has used these hazardous herbicides as part of its IPM (Integrated Pest Management) program for weed management. Montgomery Parks indicates it will release further information on the use of glyphosate in mid-March. In November last year, Montgomery County Council member Tom Hucker wrote to the head of Parks, supported by a community-wide petition, urging that glyphosate be banned immediately, pending implementation of the county ban. He cited the finding of the International Agency for Research on Cancer’s (World Health Organization) finding that the chemical probably causes cancer in humans and the $289 million jury verdict last year that the chemical caused a school groundskeeper’s non Hodgkin lymphoma. In 2016, Montgomery Parks instituted a pesticide reduction program in compliance with Montgomery County, Maryland’s 2015 adoption of County Code 33B, which aimed to regulate use of pesticides on county-owned property, including parks, and on private property. In 2017, a Montgomery Circuit Court overturned the portion of the law pertaining to a ban on private […]

(Beyond Pesticides, January 29, 2019) After eight months of deliberation and discussion, the European Parliament’s Special Committee (the PEST Committee) overwhelmingly approved its draft report in early December 2018 with recommendations to strengthen pesticide restrictions. PEST was established in January 2018 to assess the European Union’s authorization procedure for pesticides. The group’s charge was to review the European Union’s (EU’s) pesticide authorization process, identify its failures in evaluating and approving pesticides and their use (including any conflicts of interest impacting the process), and make recommendations to improve the protection of human, animal, and environmental health from pesticides. The 30-member committee concluded: improvement of the system will require changes in the entirety of the pesticide approval process — from the point of industry application for authorization of a pesticide, to the sale and use of any products containing the compound in EU Member States, to evaluation of impacts of its use once on the market. The approval, sale, use, and regulation of what the EU calls “Plant Protection Products” [PPP] — active substances used to “1) to protect plants or plant products against pests/diseases, 2) to influence the life processes of plants (such as substances influencing their growth, excluding nutrients) and […]

(Beyond Pesticides, January 18, 2019) A new analysis by Charles Benbrook, PhD, published in the journal Environmental Sciences Europe, adds to the chronicle of the failures of the U.S. Environmental Protection Agency (EPA) to protect human health from toxic pesticides, and in this subject instance, from glyphosate. Meanwhile, a French Court has pulled the license for a Roundup product, citing the French government’s failure to protect public health. In his paper, Dr. Benbrook examines the divergent positions on the carcinogenicity of glyphosate — the active ingredient in a number of herbicides, most notably Monsanto’s (now Bayer’s) Roundup — taken by the International Agency for Research on Cancer (IARC) and by EPA. The paper calls out EPA’s handling of science related to the safety of glyphosate, suggesting that the agency has discounted evidence of the compound’s association with genotoxicity — destructive effects on cellular genetic material that can cause mutations — which can result in cancer. Dr. Benbrook is an American agricultural economist, former executive director of the National Academy of Sciences board on agriculture, and former research professor at the Center for Sustaining Agriculture and Natural Resources at Washington State University. He has long studied pesticide use related to genetically engineered […]

(Beyond Pesticides, January 16, 2019) Preliminary counts in California indicate the western monarch butterfly population dropped 86% from 2017 to 2018. The survey is a result of an annual effort by volunteer citizen scientists, organized by the nonprofit organization Xerces Society. If the trend from the initial sample (97 sites) holds true, the population of overwintering butterflies is estimated to be less than 30,000 – 0.05% of its historical size. Full and vetted results will be published in late January. To get an accurate count of monarch populations, volunteers follow a monitoring guide, which recommends beginning a count on a still, cool, and dry morning so that monarchs are still clustered together. Volunteers count a small cluster of monarchs and then extrapolate that number to arrive at a total for the larger cluster they’re observing. Citizen science has been crucial to understanding the decline of monarchs and insects worldwide. As covered by The New York Times, the current “Insect Apocalypse” has largely been documented by volunteers. The dismal numbers recorded this year are potentially disastrous, as the predicted extinction threshold for overwintering western monarchs is a population of 30,000. However this threshold, based on population densities needed for thermoregulation and mating […]