As Earth Warms, the Diseases That May Lie Within Permafrost Become a Bigger Worry


By Sara Goudarzi, Scientific American – 30 October 16
Source: Reader Supported News


Scientists are witnessing the theoretical turning into reality: infectious microbes emerging from a deep freeze


This past summer anthrax killed a 12-year-old boy in a remote part of Siberia. At least 20 other people, also from the Yamal Peninsula, were diagnosed with the potentially deadly disease after approximately 100 suspected cases were hospitalized. Additionally, more than 2,300 reindeer in the area died from the infection. The likely cause? Thawing permafrost. According to Russian officials, thawed permafrost—a permanently frozen layer of soil—released previously immobile spores of Bacillus anthracis into nearby water and soil and then into the food supply. The outbreak was the region’s first in 75 years.

Researchers have predicted for years that one of the effects of global warming could be that whatever is frozen in permafrost—such as ancient bacteria—might be released as temperatures climb. This could include infectious agents humans might not be prepared for, or have immunity to, the scientists said. Now they are witnessing the theoretical turning into reality: infectious microorganisms emerging from a deep freeze.

Although anthrax occurs naturally in all soil and outbreaks unrelated to permafrost can occur, extensive permafrost thaw could increase the number of people exposed to anthrax bacteria. In a 2011 paper published in Global Health Action, co-authors Boris A. Revich and Marina A. Podolnaya wrote of their predictions: “As a consequence of permafrost melting, the vectors of deadly infections of the 18th and 19th centuries may come back, especially near the cemeteries where the victims of these infections were buried.”

And permafrost is indeed thawing—at higher latitudes and to greater depths than ever before. In various parts of Siberia the active layer above permafrost can thaw to a depth of 50 centimeters every summer. This summer, however, there was a heat wave in the region, and temperatures hovered around 35 degrees Celsius—25 degrees warmer than usual. The difference possibly expanded or deepened the thaw and mobilized microorganisms usually stuck in rigid earth. Although scientists have yet to calculate the final depth, they postulate that it is a number that has not been seen in almost a century. Permafrost thaw overall could become widespread with temperatures only slightly higher than those at present, according to a 2013 study in Science. Heat waves in higher latitudes are becoming more frequent as well.

What thawing permafrost could unleash depends on the heartiness of the infectious agent involved. A lot of microorganisms cannot survive in extreme cold, but some can withstand it for many years. “B. anthracis are special because they are sporulating bacteria,” says Jean-Michel Claverie, head of the Mediterranean Institute of Microbiology and a professor at Aix-Marseille University in France. “Spores are extremely resistant and, like seeds, can survive for longer than a century.”

Viruses could also survive for lengthy periods. In 2014 and 2015 Claverie and his colleague Chantal Abergel published their findings on two still infectious viruses from a chunk of 30,000-year-old Siberian permafrost. Although Pithovirus sibericum and Mollivirus sibericum can infect only amoebas, the discovery is an indication that viruses that infect humans—such as smallpox and the Spanish flu—could potentially be preserved in permafrost.

Human viruses from even further back could also make a showing. For instance, the microorganisms living on and within the early humans who populated the Arctic could still be frozen in the soil. “There are hints that Neandertals and Denisovans could have settled in northern Siberia [and] were plagued by various viral diseases, some of which we know, like smallpox, and some others that might have disappeared,” Claverie says. “The fact that there might be an infection continuity between us and ancient hominins is fascinating—and might be worrying.”

Janet Jansson, who studies permafrost at the Pacific Northwest National Laboratory in Washington State, is not worried about ancient viruses. Several attempts to discover these infectious agents in corpses have come up empty, she notes. She does advocate, however, for further research to identify the wide range of permafrost-dwelling organisms, some of which could pose health risks. To accomplish that goal, she and others are using modern molecular tools—such as DNA sequencing and protein analysis—to categorize the properties of unknown microorganisms, sometimes referred to as microbial dark matter.

The likelihood and frequency of outbreaks similar to the one in Siberia will depend on the speed and trajectory of climate change. For instance, it is possible that another heat wave will expose the carcasses of animals infected by anthrax, Revich says. “The situation on the Yamal Peninsula has shown that the risk of the spread of anthrax is already real,” he adds.

In effect, infectious agents buried in the permafrost are unknowable and unpredictable in their timing and ferocity. Thus, researchers say thawing permafrost is not our biggest worry when it comes to infectious diseases and global warming. The more immediate, and certain, threat to humans is the widening geographical ranges of modern infectious diseases (and their carriers, such as mosquitoes) as the earth warms. “We now have dengue in southern parts of Texas,” says George C. Stewart, McKee Professor of Microbial Pathogenesis and chair of the department of veterinary pathobiology at the University of Missouri. “Malaria is seen at higher elevations and latitudes as temperatures climb. And the cholera agent, Vibrio cholerae, replicates better at higher temperatures.”

Unlike the zombie microbes lurking in the permafrost, modern spreading diseases are more of a known quantity, and there are proved ways to curb them: mapping trends, eliminating mosquito-breeding sites and spraying insecticides. Of course, dramatically lowering fossil-fuel emissions to combat climate change could tackle both threats—the resurgence of ancient and deadly pathogens and the widening ranges of infectious diseases—in one shot.

The Cult of the Professional Class

We cannot solve our problems with the same thinking we used when we created them.

— Albert Einstein

In a recent interview on about his book Listen Liberal, author Thomas Frank spoke of the professional class that rules the Democratic Party and the orthodoxy instilled in them by their Ivy League institutions. Indeed, every president since 1988 attended an Ivy League university. Not only does this perspective from the professional class cross party lines, their orthodox worldview extends far beyond politics. It is based on an ideology that has served elites well – (semi) free-market capitalism and continuous economic growth. It is an orthodoxy that values corporate interests and personal gain over public good. It permeates all fields of society and American culture.

In their book Manufacturing Consent, Edward Herman and Noam Chomsky laid out the media propaganda model of journalism, in which they describe the small parameters of discourse allowable in mainstream media, due to factors such as advertising, corporate ownership, and the dominant elite mindset. The media propaganda model they describe is akin to the Ivy League orthodoxy of which Frank speaks. Disciplines cater to a small span of acceptable dialogue and thought based upon shared assumptions. Within that realm, diversity exists, but that diversity does not usually breach understood boundaries. Some voices reach the periphery of the border, but retract from crossing the line through caveats. Those who traverse boundaries tend to be marginalized, regardless of the substance, depth, and validity of their arguments and ideas. This orthodoxy is maintained chiefly through tacit self-censorship and is internalized by those who practice it.

The professional, upper-class orthodoxy infiltrates more than just Ivy League institutions because all others revere and aspire to it, and therefore tend to mimic it. My educational background is fairly privileged. My secondary school and undergraduate university were filled with students whose families possessed tremendous wealth, power, and advantage. My perspectives, experiences, and way of life from my modest, middle-class background were quite different from the majority of the rich students around me. People like me are subtly urged to fit in because we see that doing so would better enable us to garner the successes of the elite. But students far more disadvantaged than me have a great deal of trouble assimilating, not because they lack the intellectual ability but because they feel isolated. Thus, most who persist and whose backgrounds are anomalous – like Bill Clinton and Barack Obama – adopt the mindset of the privileged. They deny or ignore their own histories and the voices they used to hear, voices that may call into question the veracity of the elite orthodoxy.

This elite-generated social control maintains the status-quo because the status quo benefits and validates those who created and sit atop it. People rise to prominence when they parrot the orthodoxy rather than critically analyze it. Intellectual regurgitation is prized over independent thought. Voices of the dispossessed, different, and un(formally)educated are neglected regardless of their morality, import, and validity. Real change in politics or society cannot occur under the orthodoxy because if it did, it would threaten the legitimacy of the professional class and all of the systems that helped them achieve their status.

The orthodoxy is why issues such as poverty, hunger, homelessness, and deterioration of public health and the environment continue unabated. They are eminently solvable, but cannot be solved under the implicit and often defective assumptions accepted by the orthodoxy.

We see examples of orthodox rules that benefit the capitalistic elite, versus independent alternatives which are discounted or overlooked, in all aspects of modern life:

In public education:

Most privileged members of society have never set foot in a public school or taught under the mandates therein. They have little appreciation for the teaching profession, which is filled with intelligent, overworked, over-stressed, caring and devoted individuals who are crippled by lack of resources, lack of time, lack of money, and lack of autonomy. The elite create their unsound educational policies without practical knowledge and evidence – policies which (one could only assume at this point) exist to crumble the public education system and pave the way for privatization. Charter schools, common core, endless standardized testing, and erroneous teacher evaluations do not support the needs of students. The acolytes of the professional class have no clue about what is best for students, particularly students with socioeconomic hardships they cannot and do not fathom. Social support systems for students outside of the classroom, equivalent funding for all students in all public schools, teacher independence, administrative support for teachers, higher teacher pay, and smaller class sizes would do well to tackle some of the fundamental problems in public education, but these out-of-the-box solutions undermine elite authority and corporate prospects. In a similar vein, technological devices – computers, tablets, etc. – have been pushed relentlessly into classrooms, even though their enhancement of learning, according to studies, is questionable or nonexistent.

In economics:

Even Alan Greenspan admits that neoclassical economics has flaws in theory and practice, yet it continues to be the dominant model at universities and in society. The faulty belief in the uber-rational, self-interested homo economicus probably persists mainly because it is a projection of the people who inhabit the privileged class. Corporate externalization of costs are absorbed by society and forgotten when heralding the successes of industrialists and capitalists. Resource extraction and environmental degradation, which are part and parcel of production, consumption, and consequently, economic growth, are downplayed or ignored. Talk of a basic income, a maximum income or maximum wage, and wealth distribution (except flowing to the top) are left out of practical discourse. This, despite that way back in the oft-mentioned halcyon days of the 1950’s under Eisenhower, the top marginal income tax rate was over 90% and the rich did not seem to suffer a bit from it. That tax rate, effectively a maximum income, could support needed social programs and infrastructure and redistribute wealth to those who have spend the past three decades (at least) earning far less than their rightfully owed compensation given their abundant productivity. But such ideas are considered ludicrous according to the orthodoxy.

In health care and medicine:

The orthodoxy of medicine is to emphasize treatment over prevention. Though increasingly stressed during the past several decades, preventative techniques focus on personal lifestyle factors and rarely account for systemic issues. American medicine tends to deal in proximal causes of diseases, such as changes in physiology, versus distal causes, such as extrinsic factors responsible for the changes in the physiology. For instance, you go to the doctor for newly acquired migraine headaches and receive medicine to lessen the pain. Medicine is a helpful immediate remedy, but you may never get to the real cause, which is the fact that you have new carpeting in your home that is outgassing toxic substances resulting in your having headaches. Industrial causes of disease like pollution and toxic exposure are not commonly accounted for under the dominant orthodoxy. In psychology, social factors are discounted, so depression and anxiety are treated as individual mental health issues rather than stemming from an unjust and untenable society. If you are not on prescription medications for something, you are quite atypical, because health care is a business and always needs new markets under the orthodoxy. In medicine, there is also the disregard for unnecessary and questionable interventions. For example, use of CT scans proliferated before enough adequate research as to their safety and efficacy. Consequently, studies have found that excessive use of CT scans may now result in preventable cancers in at least 1 out of 2000 people undergoing CT. But rather than further understanding the body’s innate ability to heal itself in many situations and rather than utilizing the comprehensive knowledge of well-learned critical diagnosticians, medicine now over-uses technological and pharmaceutical diagnostic and treatment methods. Though these sometimes harm patients more than they help, they serve to enhance capitalism and expand economic markets.

In fiction:

Writers such as George Orwell, John Steinbeck, Sinclair Lewis and Upton Sinclair, who shed light on the ills of society and the reality of the human condition, would probably not be published today. While dystopian fiction – especially science fiction and fantasy – is quite popular, look more closely and you will find that these novels, while characterizing some of the unpleasant realities of modern society, almost always end on a bright note with hope for the future. The benefits of technology are triumphed and the negative consequences minimized. Positivity is mandated. Narratives are about escape and denial. Protagonists are heroes who almost always save the day. I recently finished the popular Ready Player One, and while it demonstrates some societal issues, each time the protagonist faces an immediate, dire situation, he manages to overcome the obstacle, often because of simple coincidence or blind providence. The tragic heroes in Shakespeare and other classic works, who are doomed to die in the end but are always better for the knowledge and experience gained, are no more. What message is sent when heroes magically overcome obstacles instead of learning lessons about themselves and their world? This narrative orthodoxy of novels also pertains to most fictional films and television series. (Though some cable shows like The Wire, Breaking Bad, and Mr. Robot seem to be puzzling exceptions.)

capitalism poverty

In environment:

Market-driven, corporate-friendly, and technological solutions to environmental issues dominate the discourse in environmental programs, in the largest environmental advocacy organizations, and in governmental policies. On the topics of climate change, toxic contamination, and pollution, questioning the necessity or sustainability of ever-increasing production and consumption is forbidden in polite company. In a panel conversation I attended about sustainability in agriculture, the discussion turned to ways of feeding a growing world population. Everyone agreed that the problem is not caused by a scarcity of food but by unequal distribution, but no one on the panel seemed to think that fact merited practical consideration. Furthermore, since at least 1/3 of food produced in the world is wasted, addressing the waste stream might mark a point at which to intervene in the problem, but the idea was scoffed at. Pragmatic discussion and research on the issue of food usually assumes the current industrial farming model. Ideas about small, independent, localized, organic systems of food growth and distribution, though favored more and more by consumers and shown in studies to be the sole sustainable method for the future, are not recognized as policy solutions by the orthodoxy. Home gardens, as anyone who tends one knows, could sustain many families fairly easily, but those require land and land is not given away for free under capitalist orthodoxy. Also, they require time, which overworked and underpaid citizens (who are even able to find work) are not allowed to have. So a system of universal gardening is not even considered. As far as toxic substances, one cannot suggest banning an unnecessary and potentially hazardous product or technology. The controversial endocrine disrupting chemical bisphenol-A (BPA) probably does not need to exist at all, as its applications are mostly superfluous to our lives, but not only are policymakers reluctant to regulate it, if they do, they will only apply the mandate of “safe levels” of exposure, even if there is no way to truly determine or evaluate a safe level for human health or the environment. Though there is no credible evidence to support the notion that limiting exposures to hazardous substances, that techno-fixes, or that “win-win” market driven solutions to environmental problems can be at all sustainable in the long-term, these are the only acceptable answers to pollution, climate change, and environmental degradation available within the orthodoxy.

Much is taken as a given under the orthodoxy; instead we might consider:

Why can’t all trade be fair trade?

Why can’t all crops be organic? Two corollaries: why do we call pesticide-laden crops “conventional” rather than “poisoned”? Why not call “organic” food just “food,” as it was prior to the petro-chemical revolution?

Why is single-payer universal healthcare, the model in most countries throughout the world, not discussed in U.S. congressional hearings on healthcare reform?

Why do we automatically denigrate poverty? Why do we not heed stories from the poor themselves?

Why is democracy celebrated as a political structure while only hierarchy is allowed in the workplace?

Why can we not question the ethical implications of wealth and excess with regard to economic inequality or environmental sustainability? Why does our dominant Judeo-Christian society value wealth and excess despite scripture clearly stating its immorality?

Why can we not factually declare the immorality of Wall Street and the general obscenity of commodifying basic necessities of life, such as food, water, and homes (real estate)?

Why is the work ethic venerated, even when that hard work may be only self-serving, or worse, may be generating tremendous harm? What’s the use of being constantly “busy” if your busyness is not useful (and may be destructive)?

Why do we not consider the direct and indirect ways our occupations – and the organizations from which we earn money and power – exploit other species, other humans, and the environment as a whole? What might happen if we were all to do so?

Why do we equate wealth – rather than empathy or altruism – with intelligence and success?

Why can we not fundamentally question capitalism?

The Ivy League-derived orthodoxy of the professional, educated class saturates all areas of American society. Alternative voices and viewpoints are ostracized through a number of means. If you do not possess the expertise and stamp of approval as authorized by the academic infrastructure, your ideas are often dismissed out of hand, however profound and substantive. If you posses the authorization to speak, but step outside of the boundaries of permissible thought (and action), your voice will remain virtually meaningless, or worse, maligned. While scholarship, research, writing, and practices outside of orthodox parameters exist at universities and in other professions, the work of these professionals does not generally penetrate the paradigms of larger society, nor does it affect large-scale public policies. Some academics suffer job loss for their unorthodox views. Steven Salita, Norman Finkelstein, and Ward Churchill are emblematic of the consequences to those who exceed the limits. Whistleblowers like Chelsea Manning, Edward Snowden, John Kirakou, and Thomas Drake who began within the parameters, for moral and ethical reasons violated the border of orthodoxy and paid a price. Environmental, social justice, peace and animal rights advocates like Tim DeChristopher and Jessica Reznicek also know the penalties for defying the orthodoxy.

Our biosphere is in a global death spiral. The sources of life support, for those who can still afford them, are diminishing in quality and quantity. None of the orthodoxy coming from the Ivies and the professional class is effecting change in this trajectory. We need other voices – voices of the disposed, disenfranchised, maligned, harmed, victimized, and powerless – to help find answers. We need to value voices of the indigenous, who have lived as close to sustainably on this planet as we have ever witnessed and whose traditions and knowledge may well be fading into oblivion. We need to respect the voices of those whose knowledge comes from experience, rather than just from books. We need to consider the voices of those whose main purpose is not professional advancement, but public good. We need to consider information from others based on the merits of their arguments and evidence, rather than the letters that follow their names.

Perhaps the worst aspect of the orthodoxy is that we cannot truly speak to that fact that humanity is no longer facing the downfall of a single nation or the destruction of a single empire, but the decimation of an entire planetary ecosystem. If we do not challenge the cabal of political and social power in America and around the world, it will likely be the death knell for us all.

Monsanto Strikes Back Against IARC : EPA Says Our Products are Safe



Susanne Posel (OC) : The International Agency for Research on Cancer (IARC), a research outreach of the World Health Organization (WHO) have classified insect and weed killers containing glyphosate as “probable carcinogens”.

Glyphosate now falls under the second level of concern; meaning it is classified as a “probable or possible carcinogen” and those exposed to the chemical could have an elevated risk for developing cancer.

Industrial use of glyphosate is of concern to IARC, not “use by home gardeners”. However, the chemical is present “in more than 750 different herbicide products and its use has been detected in the air during spraying, in water and in food.”

The IARC states that there is “convincing” evidence that glyphosate can cause the development of non-Hodgkins lymphoma. Since the chemical was discovered in the blood and urine of agricultural workers, the IARC believes the chemical is absorbed by the body during exposure.

Researchers explained that although the chemical is present in recreational weed killers, “home use is [not] the issue. It’s agricultural use that will have the biggest impact. For the moment, it’s just something for people to be conscious of.”

Conversely, Monsanto vehemently disagreed with the IARC: “All labeled uses of glyphosate are safe for human health and supported by one of the most extensive worldwide human health databases ever compiled on an agricultural product. In fact, every glyphosate-based herbicide on the market meets the rigorous standards set by regulatory and health authorities to protect human health.”

Monsanto goes on: “We believe conclusions about a matter as important as human safety must be non-biased, thorough and based on quality science that adheres to internationally recognized standards. We join others in viewing IARC’s process and its assessment with strong skepticism. IARC has previously come under criticism for both its process and demonstrated bias.”

The chemical giant argues that “the IARC classification is not based on new data. Other regulatory agencies, including the German government, have previously reviewed the same studies. The Germans concluded that glyphosate was unlikely to pose a carcinogenic risk in humans.”

Concerning the dangers of glyphosate use, in 2001 Don Huber, retired plant pathologist and professor from Purdue University (PU), wrote a letter to Tom Vislack, secretary of the US Department of Agriculture (USDA).

Huber told Vislack that a “new unidentified” pathogen, i.e. glyphosate, was causing spontaneous abortions in livestock, triggering disease in soybeans and corn, and could cause a significant disruption of domestic food and feed supplies.”

The plant pathologist continued: “It is well documented that glyphosate promotes soil pathogens and is already implicated with the increase of more than 40 plant diseases. It is urgent to examine whether the side-effects of glyphosate use may have facilitated the growth of this pathogen, or allowed it to cause greater harm to weakened plant and animal hosts.”

According to Joseph Mercola: “Increasing exposure to glyphosate, the active ingredient in Monsanto’s Roundup herbicide, may be at least partially to blame for rising rates of numerous chronic diseases in Westernized societies.”

A study published in 2013 on the adverse effects of glyphosate coalesces the many effects on the human body and how they work together to trigger health issues such as:

• Gastrointestinal disease
• Diabetes
• Heart disease
• Obesity
• Alzheimer’s disease

The researchers explained: “humans exposed to glyphosate have decreased levels of the amino acid tryptophan, which is necessary for active signaling of the neurotransmitter serotonin. Suppressed serotonin levels have been associated with weight gain, depression, and Alzheimer’s disease.”

Susanne Posel, Occupy Corporatism

Source: nsnbc

Related articles:
Study: Monsanto’s Roundup Herbicide Probably Causes Cancer – Mother Jones
Le désherbant Roundup classé cancérogène – Le Monde

The Plagues of Global Warming

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By Elizabeth Kolbert, The New Yorker, 27 February 15
Source: Reader Supported News

The black rat—also known as the ship rat, the roof rat, and the house rat—is actually gray. It has large ears and a tail that’s longer than its body. The black rat (Rattus rattus) probably evolved in tropical Asia, and then was spread around the world by humans—first by the Romans and later by European colonists. According to Juliet Clutton-Brock, the author of “A Natural History of Domesticated Mammals,” it has been blamed for causing “a greater number of deaths in the human species than any natural catastrophe or war.” But perhaps the rat has gotten a bad rap?

A paper published the other day in the Proceedings of the National Academy of Sciences, which quickly made headlines all around the world, argues that the prevailing theory of how the Black Death spread is unfair to rats. Really, the authors of the study contend, the animal responsible was a Central Asian species like the great gerbil. (Great gerbils are only distantly related to the fuzzy rodents that American kids keep as pets, though they may look a lot alike to parents.)

The authors of the study were trying to address one of the mysteries about the Black Death. Why, after killing something like twenty-five million people in Europe in the mid-fourteenth century, did outbreaks of plague keep flaring up and then dying down again? (The Great Plague of London, in the mid-seventeenth century, killed roughly a fifth of the city’s population.) The prevailing theory is—or was—that bacteria responsible for the plague, Yersinia pestis, lived on Europe’s black-rat population. The rats transmitted the bacteria to fleas, which, episodically, transmitted them to humans. But the scientists who conducted the PNAS study concluded that there were no “permanent plague reservoirs in medieval Europe.”

Instead, they posit, the plague bacterium kept being reintroduced to Europe from Asia, where it lived on the native rodent populations. They came to this conclusion after comparing tree-ring records from Europe and Asia with records of plague outbreaks. What they found was that plague seemed to show up at port cities in Europe several years after climate conditions favored a burst of population growth among rodents in Central Asia. (This theory does not completely exonerate black rats, as they would still have helped their Asian rodent brethren spread the disease once it reached Europe.)

“We show that, wherever there were good conditions for gerbils and fleas in Central Asia, some years later the bacteria shows up in harbor cities in Europe and then spreads across the continent,” one of the authors of the study, Nils Christian Stenseth, a biologist at the University of Oslo, told the BBC.

Plague is no longer a worry in Europe, although there are still occasional outbreaks in other parts of the globe. What’s perhaps the most important insight from the study has little to do with Yersinia pestis or giant gerbils. It’s that climate and human health are, in significant though often roundabout ways, related. As the climate changes, this has important—and, at the same time, hard to predict—implications.

The list of diseases (and disease vectors) that could potentially be affected by climate change is a long and various one. It includes tick-borne diseases, such as Lyme disease, and mosquito-borne diseases—dengue fever, West Nile virus, malaria. It also includes waterborne diseases, such as cholera, and fungal diseases, such as valley fever. An upcoming issue of Philosophical Transactions B, a journal of Britain’s Royal Society, is wholly devoted to the subject of “climate change and vector-borne disease.”

Rising temperatures may already be contributing to the spread of some diseases, like chikungunya, a mosquito-borne virus that, not long ago, was confined to Africa and Asia. (The name of the virus, from Kimakonde, a language spoken in Tanzania and Mozambique, means “to become contorted,” which is what happens to the virus’s victims, who experience severe joint pain.) In recent years, cases have shown up in Italy and the Caribbean, and, just last year, in Florida. While the recent spread of chikungunya probably has more to do with global trade and travel than with climate change, the mosquito that transmits the virus seems to be able to survive in more and more places as the globe warms.

“All the blocks are falling into place,” Walter Tabachnick, the director of the Florida Medical Entomology Laboratory, at the University of Florida, told NPR a few weeks ago. “You’ve got to be worried about this.”

Which brings us back to giant gerbils. If the new PNAS study is correct, then millions in Europe died because the climate conditions were sometimes favorable for these rodents a quarter of the way around the world. The indirect nature of the connection makes it hard to foresee what warming will mean for human health, which—in case you needed it—is another thing to worry about.