10 Ways Andrew Wheeler Has Decimated EPA Protections in Just One Year
By Elliott Negin
On July 8, President Trump hosted a White House event to unabashedly tout his truly abysmal environmental record. The following day, coincidentally, marked the one-year anniversary of Andrew Wheeler at the helm of the U.S. Environmental Protection Agency (EPA), first as acting administrator and then as administrator after the Senate confirmed him in late February.
The good news, if there is any, is that Wheeler is an Eagle Scout compared to his ethically challenged predecessor, Scott Pruitt. The bad news is, as predicted, Wheeler has been more effective than Pruitt in rolling back and eliminating EPA safeguards.
My organization, the Union of Concerned Scientists, has compiled a list of 80 Trump administration attacks on science since taking office, and Wheeler has been the driving force behind many of them. Below are 10 of the more egregious ways he has undermined the EPA's time-honored role to protect public health and the environment so far.
1. Sidelined Scientists
Wheeler, a former coal industry lobbyist, has taken a number of steps to systematically reduce the role of scientists in the agency's policymaking process. Last fall, for example, he eliminated the agency's Office of the Science Advisor, which counseled the EPA administrator on research supporting health and environmental standards, and placed the head of the EPA's Office of Children's Health Protection on administrative leave. He also disbanded a 20-member scientific advisory committee on particulate matter, or soot; failed to convene a similar panel on ozone; and packed a seven-member advisory committee on air quality standards with industry-friendly participants.
2. Proposed to Restrict the Use of Scientific Data
Claiming his intent is to increase "transparency," Wheeler is promoting a rule Pruitt proposed that would dramatically limit the scientific studies the agency considers when developing health standards. If adopted, the rule would restrict the use of scientific studies in EPA decisions if the underlying data are not public and reproducible, which would disqualify many epidemiological and other health studies the EPA relies on to set science-based public safeguards. Given that EPA health standards often rely on studies that contain private patient information, as well as confidential business information that cannot be revealed, the rule would significantly hamper the agency's ability to carry out its mission. Wheeler plans to finalize the rule sometime this year.
3. Gutted the Coal Ash Rule
The first major rule Wheeler signed as acting administrator refuted his claim that he could fulfill President Trump's directive to "clean up the air, clean up the water, and provide regulatory relief" at the same time. By rolling back the Obama-era coal ash rule, Wheeler provided regulatory relief to his old friend the coal industry by weakening environmental protections established in 2015 to clean up coal ash ponds, which are laced with toxic contaminants that leak into groundwater. The move was a top priority for coal baron Bob Murray, owner of Murray Energy, Wheeler's most lucrative client when he worked for the Faegre Baker Daniels law firm.
Coal-fired power plants have been dumping this residue from burning coal into giant, unlined pits for decades. According to the EPA, there are more than 1,000 coal ash disposal sites across the country, and a recent analysis by Earthjustice and the Environmental Integrity Project found that 91 percent of the coal plants filing monitoring data required by the 2015 rule are polluting water with unsafe levels of toxic contaminants. Wheeler's EPA says the new rule—which extends the deadline for closing some leaking ash ponds and allows states to suspend groundwater monitoring and set their own standards—will save utilities as much as $31 million. But the agency ignored the enormous costs of cancer and neurological and cardiovascular diseases linked to coal ash ingredients, which include arsenic, chromium, lead and mercury.
4. Recommended Unsafe Levels of Drinking Water Contaminants
Poly- and perfluoroalkyl substances (PFAS), which are used in firefighting foam and a variety of nonstick, cleaning, packaging and other household products, have been linked to thyroid disease and kidney, liver, pancreatic and testicular cancer. According to a recent study by the Environmental Working Group and Northeastern University, these chemicals threaten the drinking water supplies of an estimated 19 million Americans. A 2018 Union of Concerned Scientists report, meanwhile, found that PFAS water contamination at 130 military bases across the country exceed the 11-parts-per-trillion safety threshold determined by the Department of Health and Human Services Agency for Toxic Substances and Disease Registry. Nearly two-thirds of the sites had contamination that was more than 100 times higher than the safe level.
In February, Wheeler announced the "first-ever nationwide action plan" to regulate PFAS chemicals in water, saying the agency would develop and set a limit for two of the most prevalent PFAS chemicals, perfluorooctanoic acid and perfluorooctanesulfonic acid. During the announcement, he told reporters he believes the agency's voluntary 70-part-per-trillion health-advisory level for the chemicals is "a safe level for drinking water," despite the fact that this level is more than six times higher than what the Disease Registry considers safe.
While Wheeler slow-walks the EPA's response, members of Congress have introduced at least a dozen bills to address PFAS contamination, and the Senate recently passed a defense bill that would require the EPA to set a science-based standard for PFAS in drinking water.
5. Rolled Back Clean Water Act Protections
Clearing up a decade-long dispute over the scope of the Clean Water Act, the Obama EPA adopted a broad, science-based definition of the law that included protecting intermittent and ephemeral streams and wetlands that do not have surface water connections to other waterways. A 2015 EPA meta-analysis of more than 1,200 peer-reviewed studies concluded that even infrequently flowing small streams and isolated wetlands can affect "the integrity of downstream waters." Trash them and that pollution could wind up in rivers, lakes, reservoirs and estuaries.
Regardless, Wheeler announced plans during a December telephone press briefing to reverse the Obama EPA definition of waters protected by the Clean Water Act, a thinly disguised gift to land developers and the agriculture industry. When asked what wetlands would no longer be protected, Wheeler replied, "We have not done … a detailed mapping of all the wetlands in the country." Likewise, EPA Office of Water head David Ross—who represented industry clients against the EPA before joining the Trump administration—told reporters on the call that the agency had no idea how many streams would be dropped from Clean Water Act protection under the proposal.In fact, Wheeler and Ross were well aware of the damage their new definition would do. At least 18 percent of streams and 51 percent of wetlands across the country would not be covered under their proposed definition, according to an internal 2017 slideshow prepared by the EPA and the Army Corps of Engineers and obtained by E&E News under the Freedom of Information Act.
6. Suppressed an Inconvenient Formaldehyde Report
Last August, Wheeler disingenuously told a Senate committee that the EPA was holding up the release of a report on the risk of cancer from formaldehyde to confirm its veracity. "I am sure we will release it," he said, "but I need to make sure that the science in the report is still accurate."
In fact, the report—which concluded that formaldehyde can cause leukemia and nose and throat cancer—was completed by EPA scientists a year before Wheeler testified, according to a Senate investigation, and their conclusion was hardly a surprise. Both the World Health Organization's International Agency for Research on Cancer and the U.S. Department of Health and Human Services National Toxicology Program have already classified formaldehyde as a known human carcinogen.
The EPA's review process normally takes 60 to 90 days. The formaldehyde report has been in limbo for at least a year and a half, a blatant giveaway to the American Chemistry Council, the U.S. chemical industry's premier trade association, which has blocked tighter restrictions on formaldehyde for decades.
7. Ignored EPA Scientists’ Advice to Ban Asbestos
Instead of heeding the advice of agency scientists and lawyers to follow the example of 55 other countries and ban asbestos completely, the EPA announced in April that it would tighten restrictions on asbestos—not ban it—despite overwhelming scientific evidence of its dangers. Manufacturers will be able to continue to use the substance if they obtain EPA approval.
Asbestos has not been produced in the United States since 2002, but is still imported for use in a wide range of commercial and consumer products, including auto brake components, roofing, vinyl floor tile, fire-resistant clothing, and cement pipes, sheets and shingles. One of the deadliest known carcinogens, asbestos kills nearly 40,000 Americans annually, mainly from lung cancer.
8. Weakened the Mercury Emissions Rule
In late December, the EPA proposed to significantly weaken a rule restricting mercury emissions from coal-fired power plants by recalculating its costs and benefits. The Obama EPA, which issued the rule in 2011, estimated it would cost utilities $7.4 billion to $9.6 billion annually to install pollution controls and lead to $37 billion to $90 billion in health benefits by reducing not only mercury, a potent neurotoxin, but also sulfur dioxide and soot, thus preventing 130,000 asthma attacks, 4,700 heart attacks, and as many as 11,000 premature deaths. The Wheeler EPA ignored the "co-benefits" of limiting sulfur dioxide and soot, and flagrantly lowballed the health benefits of curbing mercury alone at only $4 million to $6 million annually.
Most utilities have already complied with the mercury rule at a fraction of the estimated cost, but health advocates fear that this new, industry-friendly accounting method, which makes it appear that the cost to polluters far outweigh the rule's benefits, will set a precedent for the EPA to sabotage an array of other public health protections.
9. Slammed Vehicle Emission Rules Into Reverse
Last August, the EPA and the Transportation Department issued a proposal to freeze vehicle tailpipe pollution and fuel efficiency standards, rolling back a 2012 Obama-era rule requiring automakers to boost passenger vehicle fuel economy to a fleetwide average of 54 miles per gallon by 2025. In a Wall Street Journal opinion piece titled "Make Cars Great Again" published a few days before the two agencies announced their proposal, Wheeler and Transportation Secretary Elaine Chao charged that the Obama-era standards—the first to limit vehicle carbon emissions—are too burdensome for automakers and "raised the cost and decreased the supply of newer, safer vehicles."
Parroting the Trump administration's line of reasoning, Wheeler and Chao argued that fuel-efficient cars—which weigh less than gas-guzzlers—are not as safe, a contention that has been widely debunked. In fact, a 2017 study concluded that reducing the average weight of new vehicles could result in fewer traffic fatalities.
In any case, freezing the standards at 2020 levels would be hard on the planet, not to mention Americans' wallets, according to the Union of Concerned Scientists. It would result in an additional 2.2 billion metric tons of global warming emissions by 2040, amounting to 170 million metric tons in 2040 alone—the equivalent of the annual output of 43 average size coal-fired power plants. It also would cost drivers billions of dollars. In 2040 alone, they would have to pay an additional $55 billion to fill their gas tanks. Meanwhile, the design improvements automakers have made so far to meet the standards have already saved drivers more than $86 billion at the pump since 2012, and off-the-shelf technological fixes, the Union of Concerned Scientists says, would enable automakers to meet the original 2025 target.
10. Rescinded the Clean Power Plan
Perhaps Wheeler's most damaging move to date came late last month when he signed a final rule to repeal and replace the Obama-era Clean Power Plan, which would have required coal-fired power plants to dramatically cut their carbon emissions. Yet another gift to the coal industry, Wheeler's so-called Affordable Clean Energy rule grants states the authority to determine emissions standards but sets no targets, leaving them the option to do absolutely nothing.Before Wheeler released the final rule, an April study in the journal Environmental Research Letters found that his draft version would boost carbon emissions in 18 states and the District of Columbia and increase sulfur dioxide emissions in 19 states. The EPA's own analysis of the draft rule, meanwhile, found that the proposal could have led to as many as 1,400 premature deaths annually by 2030 due to an increase in soot, and as many as 15,000 cases of upper respiratory problems.
Reversing Decades of Bipartisan Protections
If Wheeler truly cared about transparency, he would petition the Trump administration to change the name of his agency to "Every Polluter's Ally." In just 12 months, he has killed or weakened dozens of safeguards with the sole intention of bolstering polluting industries' profit margins even after Congress slashed the corporate tax rate. As a result, millions of Americans will be drinking filthier water and breathing dirtier air, and more will suffer from serious diseases, according to his agency's own accounting.
Wheeler and his predecessor Pruitt have sullied the bipartisan track record of one of the nation's agencies entrusted with protecting public health and safety. So it is little wonder that three former EPA administrators who, notably, served under Republican presidents, recently sounded the alarm on Capitol Hill, urging legislators to step up their oversight of the agency and denouncing its attempts to hamstring science."There is no doubt in my mind that under the current administration the EPA is retreating from its historic mission to protect our environment and the health of the public from environmental hazards," former EPA Administrator Christine Todd Whitman, who served under President George W. Bush, stated in her written testimony for the House Committee on Energy and Commerce Subcommittee on Oversight and Investigations. "This administration, from the beginning, has made no secret of its intention to essentially dismantle the EPA…. Therefore, I urge this committee, in the strongest possible terms, to exercise Congress's oversight responsibilities over the actions and direction of the EPA."
Elliott Negin is a senior writer at the Union of Concerned Scientists.
EcoWatch Daily Newsletter
By Alexander Richard Braczkowski, Christopher O'Bryan, Duan Biggs, and Raymond Jansen
A Cute But Threatened Species<p><a href="https://www.worldwildlife.org/stories/what-is-a-pangolin" target="_blank">Pangolins</a> are the only mammals wholly-covered in scales, which they use to protect themselves from predators. They can also curl up into a tight ball.</p><p>They eat mainly ants, termites and larvae which they pick up with their sticky tongue. They can grow up to 1m in length from nose to tail and are sometimes referred to as scaly anteaters.</p><p>But <a href="https://www.sciencedirect.com/science/article/pii/B9780128155073000332" title="Chapter 33 - Conservation strategies and priority actions for pangolins" target="_blank">all eight</a> pangolin species are classified as "<a href="https://www.pangolins.org/tag/endangered-species/" target="_blank">threatened</a>" under International Union for Conservation of Nature <a href="https://www.iucnredlist.org/search?query=pangolin&searchType=species" target="_blank">criteria</a>.</p><p>There is an unprecedented demand for their scales, primarily from countries in Asia and <a href="https://conbio.onlinelibrary.wiley.com/doi/10.1111/conl.12389" title="Assessing Africa‐Wide Pangolin Exploitation by Scaling Local Data" target="_blank">Africa</a> where they are used in food, cultural remedies and <a href="https://www.nature.com/articles/141072b0" title="Chinese Medicine and the Pangolin" target="_blank">medicine</a>.</p><p>Between 2017 and 2019, seizures of pangolin scales <a href="https://www.nationalgeographic.com/animals/2020/02/pangolin-scale-trade-shipments-growing/" target="_blank">tripled in volume</a>. In 2019 alone, 97 tons of pangolin scales, equivalent to about 150,000 animals, were <a href="https://oxpeckers.org/2020/03/nigeria-steps-up-for-pangolins/" target="_blank">reportedly</a> intercepted leaving Africa.</p>
Reintroduction of an Extinct Species<p>Each year in South Africa the African Pangolin Working Group (<a href="https://africanpangolin.org/" target="_blank">APWG</a>) retrieves between 20 and 40 pangolins through intelligence operations with security forces.</p><p>These pangolins are often-traumatised and injured and are admitted to the <a href="http://www.johannesburgwildlifevet.com/our-hospital" target="_blank">Johannesburg Wildlife Veterinary Hospital</a> for extensive medical treatment and rehabilitation before they can be considered for release.</p><p>In 2019, seven rescued Temminck's pangolins were reintroduced into South Africa's <a href="https://www.andbeyond.com/destinations/africa/south-africa/kwazulu-natal/phinda-private-game-reserve/" target="_blank">Phinda Private Game Reserve</a> in the KwaZulu Natal Province.</p><p>Nine months on, five have survived. This reintroduction is a world first for a region that last saw a viable population of this species in the 1980s.</p><p>During the release, every individual pangolin followed a strict regime. They needed to become familiar with their new surroundings and be able to forage efficiently.</p>
A ‘Soft Release’ in to the Wild<p>The process on Phinda game reserve involved a more gentle ease into re-wilding a population in a region that had not seen pangolins for many decades.</p><p>The soft release had two phases:</p><ol><li>a pre-release observational period</li><li>an intensive monitoring period post release employing GPS satellite as well as VHF tracking tags.</li></ol>
Why Pangolin Reintroduction is Important<p>We know so little about this group of mammals that are vastly understudied and hold many secrets yet to be discovered by science but are on the verge of collapse.</p><p>The South African and Phinda story is one of hope for the Temminck's pangolin where they once again roam the savanna hills and plains of Zululand.</p><p>The process of relocating these trade animals back into the wild has taken many turns, failures and tribulations but, the recipe of the "soft release" is working.</p>
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By Jake Johnson
In a move that environmentalists warned could further imperil hundreds of endangered species and a protected habitat for the sake of profit, President Donald Trump on Friday signed a proclamation rolling back an Obama-era order and opening nearly 5,000 square miles off the coast of New England to commercial fishing.
Why You Should Wash Fresh Produce<p>Global pandemic or not, properly washing fresh fruits and vegetables is a good habit to practice to minimize the ingestion of potentially harmful residues and germs.</p><p>Fresh produce is handled by numerous people before you purchase it from the grocery store or the farmers market. It's best to assume that not every hand that has touched fresh produce has been clean.</p><p>With all of the people constantly bustling through these environments, it's also safe to assume that much of the <a href="https://www.healthline.com/nutrition/fresh-vs-frozen-fruit-and-vegetables" target="_blank">fresh produce</a> you purchase has been coughed on, sneezed on, and breathed on as well.</p><p>Adequately washing fresh fruits and vegetables before you eat them can significantly reduce residues that may be left on them during their journey to your kitchen.</p><p><strong>Summary</strong></p><p><strong></strong>Washing fresh fruits and vegetables is a proven way to remove germs and unwanted residues from their surfaces before eating them.</p>
Best Produce Cleaning Methods<p>While rinsing fresh produce with water has long been the traditional method of preparing fruits and veggies before consumption, the current pandemic has many people wondering whether that's enough to really clean them.</p><p>Some people have advocated the use of soap, <a href="https://www.healthline.com/nutrition/white-vinegar" target="_blank">vinegar</a>, lemon juice, or even commercial cleaners like bleach as an added measure.</p><p>However, health and food safety experts, including the Food and Drug Administration (FDA) and Centers for Disease Control (CDC), strongly urge consumers not to take this advice and stick with plain water.</p><p>Using such substances may pose further health dangers, and they're unnecessary to remove the most harmful residues from produce. <a href="https://www.healthline.com/health/chlorine-poisoning" target="_blank">Ingesting commercial cleaning chemicals</a> like bleach can be lethal and should never be used to clean food.</p><p>Furthermore, substances like lemon juice, vinegar, and produce washes have not been shown to be any more effective at cleaning produce than plain water — and may even leave additional deposits on food.</p><p>While some research has suggested that using neutral electrolyzed water or a baking soda bath can be even more effective at removing certain substances, the consensus continues to be that cool tap water is sufficient in most cases.</p><p><strong>Summary</strong></p><p><strong></strong>The best way to wash fresh produce before eating it is with cool water. Using other substances is largely unnecessary. Plus they're often not as effective as water and gentle friction. Commercial cleaners should never be used on food.</p>
How to Wash Fruits and Vegetables With Water<p>Washing fresh fruits and vegetables in cool water before eating them is a good practice when it comes to health hygiene and food safety.</p><p>Note that fresh produce should not be washed until right before you're ready to eat it. Washing fruits and vegetables before storing them may create an environment in which bacterial growth is more likely.</p><p>Before you begin washing fresh produce, <a href="https://www.healthline.com/health/how-long-should-you-wash-your-hands" target="_blank">wash your hands well</a> with soap and water. Be sure that any utensils, sinks, and surfaces you're using to prepare your produce are also thoroughly cleaned first.</p><p>Begin by cutting away any bruised or visibly rotten areas of fresh produce. If you're handling a fruit or vegetable that'll be peeled, such as an orange, wash it before peeling it to prevent any surface bacteria from entering the flesh.</p><p>The general methods to wash produce are as follows:</p><ul><li><strong>Firm produce.</strong> Fruits with firmer skins like apples, lemons, and pears, as well as <a href="https://www.healthline.com/nutrition/root-vegetables" target="_blank">root vegetables</a> like potatoes, carrots, and turnips, can benefit from being brushed with a clean, soft bristle to better remove residues from their pores.</li><li><strong>Leafy greens.</strong> Spinach, lettuce, Swiss chard, leeks, and cruciferous vegetables like Brussels sprouts and bok choy should have their outermost layer removed, then be submerged in a bowl of cool water, swished, drained, and rinsed with fresh water.</li><li><strong>Delicate produce.</strong> Berries, mushrooms, and other types of produce that are more likely to fall apart can be cleaned with a steady stream of water and gentle friction using your fingers to remove grit.</li></ul><p>Once you have thoroughly rinsed your produce, dry it using a clean paper or cloth towel. More fragile produce can be laid out on the towel and gently patted or rolled around to dry them without damaging them.</p><p>Before consuming your fruits and veggies, follow the simple steps above to minimize the amount of germs and substances that may be on them.</p><p><strong>Summary</strong></p><p><strong></strong>Most fresh fruits and veggies can gently be scrubbed under cold running water (using a clean soft brush for those with firmer skins) and then dried. It can help to soak, drain, and rinse produce that has more dirt-trapping layers.</p>
The Bottom Line<p>Practicing good food hygiene is an important health habit. Washing fresh produce helps minimize surface germs and residues that could make you sick.</p><p>Recent fears during the <a href="https://www.healthline.com/coronavirus" target="_blank">COVID-19 pandemic</a> have caused many people to wonder whether more aggressive washing methods, such as using soap or commercial cleaners on fresh produce, are better.</p><p>Health professionals agree that this isn't recommended or necessary — and could even be dangerous. Most fruits and vegetables can be sufficiently cleaned with cool water and light friction right before eating them.</p><p>Produce that has more layers and surface area can be more thoroughly washed by swishing it in a bowl of cool water to remove dirt particles.</p><p>Fresh fruits and vegetables offer a number of healthy nutrients and should continue to be eaten, as long as safe cleaning methods are practiced.</p>
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By Danielle Nierenberg
Following the murder of George Floyd by police in Minneapolis, people around the United States are protesting racism, police brutality, inequality, and violence in their own communities. No matter your political affiliation, the violence by multiple police departments in this country is unacceptable.
Mangroves play a vital role in capturing carbon from the atmosphere. Mangrove forests are tremendous assets in the fight to stem the climate crisis. They store more carbon than a rainforest of the same size.
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Monday is World Oceans Day, but how can you celebrate our blue planet while social distancing?
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By Jacob L. Steenwyk and Antonis Rokas
From the mythical minotaur to the mule, creatures created from merging two or more distinct organisms – hybrids – have played defining roles in human history and culture. However, not all hybrids are as fantastic as the minotaur or as dependable as the mule; in fact, some of them cause human diseases.
When Looking Through a Microscope Isn’t Close Enough.<p>For the last few years, <a href="http://www.rokaslab.org/" target="_blank">our team at Vanderbilt University</a>, <a href="https://www.researchgate.net/lab/Gustavo-Goldman-Lab" target="_blank">Gustavo Goldman's team at São Paulo University in Brazil</a> and many other collaborators around the world have been collecting samples of fungi from patients infected with different species of <em>Aspergillus</em> molds. One of the species we are particularly interested in is <a href="https://doi.org/10.1006/rwgn.2001.0082" target="_blank"><em>Aspergillus nidulans</em>, a relatively common and generally harmless fungus</a>. Clinical laboratories typically identify the species of <em>Aspergillus</em> causing the infection by examining cultures of the fungi under the microscope. The problem with this approach is that very closely related species of <em>Aspergillus</em> tend to look very similar in their broad morphology or physical appearance when viewing them through a microscope.</p><p>Interested in examining the varying abilities of different <em>A. nidulans</em> strains to cause disease, we decided to analyze their total genetic content, or genomes. What we saw came as a total surprise. We had not collected <em>A. nidulans</em> but <em>Aspergillus latus</em>, a close relative of <em>A. nidulans</em> and, as we were to soon find out, <a href="https://doi.org/10.1016/j.cub.2020.04.071" target="_blank">a hybrid species that evolved through the fusion of the genomes</a> of two other <em>Aspergillus</em> species: <em>Aspergillus spinulosporus</em> and an unknown close relative of <em>Aspergillus quadrilineatus</em>. Thus, we realized not only that these patients harbored infections from an entirely different species than we thought they were, but also that this species was the first ever <em>Aspergillus</em> hybrid known to cause human infections.</p>
Several Different Fungal Hybrids Cause Human Disease.<p>Hybrid fungi that can cause infections in humans are well known to occur in several different lineages of single-celled fungi known as yeasts. Notable examples include multiple different species of <a href="https://doi.org/10.1002/yea.3242" target="_blank">yeast hybrids</a> that cause the human diseases <a href="https://rarediseases.info.nih.gov/diseases/6218/cryptococcosis" target="_blank">cryptococcosis</a> and <a href="https://www.cdc.gov/fungal/diseases/candidiasis/index.html" target="_blank">candidiasis</a>. Although pathogenic yeast hybrids are well known, our discovery that the <em>A. latus</em> pathogen is a hybrid is a first for molds that cause disease in humans.</p>
(Left) Candida yeasts live on parts of the human body. Imbalance of microbes on the body can allow these yeasts, some of which are hybrids, to grow and cause infection. (Right) Cryptococcus yeasts, including ones that are hybrids, can cause life-threatening infections in primarily immunocompromised people. Centers for Disease Control and Prevention<p><a href="https://doi.org/10.1371/journal.ppat.1008315" target="_blank">Why certain <em>Aspergillus</em> species are so deadly</a> while others are harmless remains unknown. This may in part be because <a href="https://doi.org/10.1016/j.fbr.2007.02.007" target="_blank">combinations of traits, rather than individual traits</a>, underlie organisms' ability to cause disease. So why then are hybrids frequently associated with human disease? Hybrids inherit genetic material from both parents, which may result in new combinations of traits. This may make them more similar to one parent in some of their characteristics, reflect both parents in others or may differ from both in the rest. It is precisely this mix and match of traits that hybrids have inherited from their parental species that <a href="https://www.nytimes.com/2010/09/14/science/14creatures.html" target="_blank">facilitates their evolutionary success</a>, including their ability to cause disease.</p>