Researchers Assess the Impacts of Living in a Chemical Soup
Inside Oregon State University’s Sinnhuber Aquatic Research Laboratory are rooms lined with tanks filled with thousands of zebrafish—silver, striped, one-to-two-inch creatures often found in home aquariums. The lab is the domain of Robert Tanguay, professor of molecular toxicology at Oregon State, whose zebrafish are helping to answer one of the most pressing questions in environmental health and toxicology: what are the health effects of chemical mixtures?
Tanguay has pioneered the use of zebrafish in toxicology. His lab is on the leading edge of this research, designing new experimental techniques and equipment that are enabling scientists to assess the impacts of multiple chemical exposures. Using zebrafish, Tanguay and other scientists are zeroing in on why certain chemical components of crude oil spilled by the Exxon Valdez in 1989 continue to adversely affect fish survival in Alaska’s Prince William Sound. With zebrafish, they also are learning why pesticide runoff can impair Pacific Northwest salmon’s ability to navigate and how oil from the ruptured Deepwater Horizon well is affecting marine species’ health in the Gulf of Mexico.
But zebrafish research goes well beyond the impact of chemical exposures on marine life. Zebrafish studies are also being used to assess the potential human health impacts of the chemical stew in U.S. Superfund sites. Tanguay’s lab is conducting research for the U.S. Environmental Protection Agency (EPA), evaluating the toxicity of thousands of chemicals used in countless consumer products. Zebrafish are also proving key to advancing our understanding of how particular chemical compounds affect the expression of individual genes that maintain and influence virtually every body system.
“Some people are still skeptical about how a fish can model human health,” said Tanguay during a tour of his lab earlier this month. “But during early development we are more similar to fish than at any other time in life.” Genes are particularly susceptible to environmental chemicals in early development. What happens then can set the stage for health throughout the rest of life.
The work of Tanguay and colleagues on mixtures is particularly important because, historically, chemicals have been evaluated and regulated one at a time. In reality, however, we are exposed to multiple chemicals daily throughout our lives. Because we now know that environmental chemical exposure can profoundly influence the development of disease, understanding how mixtures may affect human health has taken on an urgency.
“We live in a chemical soup,” says Linda Birnbaum, director of the U.S. National Toxicology Program and the National Institutes of Environmental Health Science (NIEHS).
Zebrafish have been used since the 1990s for genetic modeling and screening, but it was Tanguay, while working as a post-doctoral fellow in 1995, who suggested they might be used in toxicology. Because they are vertebrates, these prolifically reproducing fish turn out to be an extremely useful model for understanding how cells in other vertebrates, including humans, respond to environmental chemicals. Zebrafish, which progress from a translucent egg to a recognizable baby fish in just 24 hours, are ideal for investigating how chemicals may affect biological processes at various stages of development.
Because zebrafish eggs develop outside the mother, they can be manipulated, and Tanguay’s lab has devised equipment and techniques for isolating the eggs to examine the effects of chemicals. In one lab, Tanguay showed me a petri dish containing translucent zebrafish eggs, no bigger than a poppy seed, and the thread-fine, glass needles used to extract genetic material. Tanguay’s researchers use that material to determine which base pair—a rung in the DNA double-helix ladder—is targeted by a particular chemical exposure.
The results of these perturbations will tell the scientists if the exposure prompts any physical or health abnormalities. The zebrafish genome has been sequenced, enabling scientists to identify genes associated with specific diseases. Because many zebrafish genes have human counterparts, what’s learned from these fish can be used to inform human health research.
By figuring out which chemical targets a specific genetic receptor, scientists can begin to connect chemical exposure to health effects. Zebrafish development is readily visible, enabling scientists to identify changes in a fish’s phenotype—its physical characteristics. The zebrafish’s rapid development and short generational cycle make it possible to pinpoint effects that could be difficult to see in other animals. After linking chemical and physical effects, scientists then work to connect the phenotype with the genetic mechanisms that prompt it—or, as Tanguay says, to “connect phenotype with genotype.”
Some of these changes may result in physical abnormalities. Zebrafish exposed to certain dioxins, for example, had deformed vertebrae and skulls. Dioxin exposure also impaired regeneration of wounded fins. Other changes may become apparent in neurological, cognitive and behavioral testing. Still others may be exhibited as abnormalities in reproduction, altered developmental timing or changes in how metabolism and other body systems function.
Zebrafish are instrumental in the research that Nat Scholz, the ecotoxicology program manager at the National Oceanic and Atmospheric Administration’s Northwest Fisheries Science Center, is conducting to investigate the effects of what he calls “cocktails of pollution” on different fish species, including Pacific Northwest salmon and herring. Among the combinations of chemicals he’s studying are those of various fuel oil compounds, particularly polycyclic aromatic hydrocarbons (PAHs) and pesticides.
Using zebrafish, Scholz and his colleagues have discovered that certain PAHs adversely impact cardiovascular development, leading to a heart failure syndrome that can be lethal to fish larvae and reduce adult fish survival. The work with zebrafish has enabled the scientists to discover why fish that looked normal were dying. By examining how low levels of PAH exposure interfere with genes involved in heart development, they have begun to understand how oil from the Exxon Valdez and Deepwater Horizon spills has impaired the cardiovascular function of fish at a cellular level.
While the PAH exposure prompts changes early in development, these effects may not become apparent until later on, when defects—in how the heart processes potassium and calcium and in heart structure—reduce cardiac function and cause swimming problems. Experiments with zebrafish have helped deduce which enzymes and genetic receptors are affected by which hydrocarbon compounds, something that’s not been possible with fish in the wild.
Tanguay’s lab is also working with the EPA and NIEHS on an ongoing project known as Tox21, which is assessing more than 10,000 commercially produced chemicals for a wide number of health effects. Zebrafish are being used as part of what is called “high-throughput” screening—the rapid testing of lots of chemicals. The goal is to fill the many gaps in toxicity data that exist for these chemicals and identify which chemical compositions or concentrations prompt specific health effects. Results of this screening are expected later this year.
“We call this Robot Row,” said Tanguay, showing me the lab area devoted to robotic machines designed to precisely dose hundreds of zebrafish eggs and genetic material samples. Because zebrafish develop so quickly, lots of variables can be examined concurrently using these machines. Tanguay’s lab uses what look like tiny paint palettes with an array of 96 little wells, each of which gets a zebrafish sample that is then dosed by a machine with a particular chemical at different concentrations. Some experimentally treated eggs are allowed to develop, while others are halted to examine impacts during embryonic development.
Tanguay is also working with Terry Collins, professor of chemistry and director of Carnegie Mellon University’s Institute for Green Science, to assess the toxicity of molecules Collins has invented to clean up environmental contaminants. These compounds, known as TAML activators, can be used to remove dyes and other toxic chemicals from water. The TAML compounds appear to be successful in degrading these hazardous chemicals, but Collins wants to make sure their use doesn’t produce other harmful compounds or effects. Collins’ and Tanguay’s labs have been testing TAML activators on zebrafish to determine any potential toxicity, including on endocrine hormones.
The scientists are examining a complex range of possible outcomes that may result from the chemicals’ interaction with specific genetic receptors at different stages of development. If no abnormal effects are seen after the various TAML exposures, Collins will be closer to determining the safety of his chemical products. If adverse effects are seen, he will have the information he needs to begin redesigning his compounds so they are safe to use.
Tanguay’s lab has also designed equipment to test cognitive and behavioral responses in zebrafish. Similar to tests used with other lab animals, including humans, these experiments reveal how the brain, nervous system and muscles may be affected by certain chemicals, such as organophosphate pesticides, known neurotoxicants that have been linked to adverse neurological effects in children. By using zebrafish, scientists have begun to locate which neurons these chemicals may affect at particular stages of development. These experiments are also being used to test the effects on fish of pesticide-laden water running off fields and roads.
The ultimate goal is to learn which chemical combinations, concentrations and structures alter the normal function of genes and hormones. There is strong evidence, for example, that interference with endocrine system hormones and the genes that regulate them can lead to metabolic disorders such as diabetes and obesity. Research has also shown that endocrine-disrupting chemicals can upset reproductive, developmental, immune system and neurological health. In addition, scientists have discovered that altered gene expression—distinctly different from genetic mutation—can be passed from one generation to another in what are called epigenetic effects. Pinpointing these precursors to disease is key to protecting and improving human health.
The ability to connect specific chemicals in the environment with mechanisms of disease is essential to finding and “eliminating those that are nasty,” explains Tanguay. In a world where manufactured chemicals are ubiquitous, the tiny, fecund zebrafish is playing a big role in discovering how this chemical stew is affecting our health.
Do you feel embarrassed due to the foul odor coming from your mouth? Or your oral hygiene isn't as good as before, and you are suffering from gingivitis (inflammation of gums)?
Well, these oral problems are skyrocketing, and even young people are suffering from oral issues that result in a lack of confidence.
It's common to change your toothpaste by seeing the TV commercials that claim to free you from bad breath or sensitive teeth, but these products don't always work.
Fighting oral issues isn't that easy, even if you religiously follow what your primary school teacher has taught, to "Brush two times a day!"
Well, there is a much-hyped supplement in the market that claims to help you fight all of these oral issues: The Steel Bite Pro.
Steel Bite Pro is an oral supplement that claims to cure bad breath and other such oral issues like sensitivity and gum problems.
But does the supplement really work, or is it just like the useless toothpaste that you tried before? Let's find out in this review.
Who Should Use Steel Bite Pro?
The best part about Steel Bite Pro is that anyone can use the supplement to get rid of oral issues. The supplement contains natural ingredients such as turmeric, zinc, alfalfa, jujube seeds, and much more, so there are no chemicals at all.
No matter whether you are 20 or 60, you can use this supplement to overcome oral issues and get the confidence back that you are missing due to bad odor and sensitive teeth.
Steel Bite Pro Review: Overview of the Supplement
Steel Bite Pro is an all-natural supplement that contains a mix of natural supplements to rebuild your gums and teeth.
The supplement contains 29 different foods that help you reduce the gum pain and other dental problems you have been facing for years.
More than 55,000 people have used Steel Bite Pro till now, and the results of the supplement are pretty impressive. Furthermore, the supplement is prepared in an FDA-approved facility in the USA.
It is available in the form of pills that you can consume anytime, so using the supplement is incredibly convenient. There are numerous benefits of using the Steel Bite Pro as it solves a plethora of dental problems.
Pros and Cons: Steel Bite Pro
To understand the supplement better, it is essential to know about its pros and cons.
Convenient to Use
The dietary supplement is convenient to use as it comes in the form of pills. You can take the pill anytime, even when you are in your office or somewhere else. Now there is no need to use multiple kinds of toothpaste and splurge money by visiting a dentist.
All the ingredients present inside the supplement are natural, and there are no chemicals that can harm your teeth or gums.
When you compare the cost of 1 bottle with the cost of a special toothpaste with the fee that your dentist charges, Steel Bite Pro will seem much more affordable. The supplement is available in multiple packages, so you will find it affordable to use.
No Side Effects at All
There are no side effects to using Steel Bite Pro, so you can rest assured that you won't face any headaches or other issues while curing the oral issues. The reason why Steel Bite Pro has no side effects is due to its natural ingredients.
Designed by Experts
The supplement is designed by experts that have been in the industry for years.
No Additional Medicines Are Required
When you are using Steel Bite Pro, you can avoid using other medicines that you have been taking to cure oral issues.
Attacks on the Pain
There are several ingredients present in Steel Bite Pro that attack tooth and gum pain so that you get some instant relief with the supplement.
Comes With a Money Back Guarantee
The supplement comes with a 60-day money back guarantee, so you can claim a full refund if you find the supplement isn't working for you, or if it isn't doing what the manufacturer has promised.
You Can Purchase It From the Official Site Only
The supplement is only available for purchase from the Official Website. Sometimes the supplement gets out of stock, so you have to wait for it to get back in stock.
A Single Bottle Costs More
If you buy a single bottle of the supplement, it'll cost you more than other packages with multiple bottles.
Ingredients in Steel Bite Pro
All the ingredients present in Steel Bite Pro are natural and have proven benefits for humans. Here is a list of supplements explained in detail and how they can benefit you if you start using Steel Bite Pro.
As per a study, there are innumerable benefits of using turmeric on your teeth. The natural herb has antimicrobial properties that help remove the plaque effectively from the teeth, exterminate bacteria and help cure sensitivity.
Moreover, turmeric is good for fighting oral inflammation issues. When applied on teeth, the ingredient gives instant relief from pain and is effective in curing mouth ulcers as well.
Berberine is a natural herb with proven antioxidant power to help you get rid of microorganisms developing inside the mouth. Furthermore, the ingredient has anti-inflammatory properties and is good for curing oral issues caused due to viruses and bacteria.
It is another natural ingredient that is used in a range of health supplements due to its healing power. The ingredient naturally heals the gums and the damage caused to the teeth by bacteria and microorganisms.
As per a study, it helps reduce the infection, oral pain, and cures other dental issues.
Your liver has a significant impact on your oral health, and that's where milk thistle works. The natural ingredient eliminates toxins from the liver and detoxifies your mouth as well.
Here is a study that proves how milk thistle is beneficial in detoxifying the liver.
The decaying of teeth is the initial phase of damage caused by bacteria thriving inside your mouth. Alfalfa works by reducing tooth sensitivity drastically and repairs the tooth decay caused by the bacteria.
It even stops the bacteria from growing further so you can expect good oral health.
A lot of natural supplements for teeth contain ginger because of its benefits on the teeth and the stomach. This ingredient present in the Steel Bite Pro reduces nausea and inflammation.
As per this study, there are umpteen other benefits of ginger as well, such as it maintains the pH inside your mouth.
Jujube seeds are good for boosting the immunity. Also, the ingredient has excellent antioxidant properties and is rich in Vitamin C, which is beneficial for the teeth and overall oral health.
Dandelion is a natural ingredient extracted from herbs. The ingredient is rich in minerals and has immense benefits such as fighting the bacteria and preventing the infections occurring inside your mouth.
Zinc is essential for teeth, and that is why many toothpaste brands advertise that their product contains a good amount of zinc. Further, zinc is a natural immunity booster and fights against bacteria to prevent gum disease and cavities.
Moreover, zinc repairs the enamel on your teeth that's damaged due to toothpaste or any other reasons. Here is a study that shows the benefits of zinc for your teeth and mouth.
Chicory root acts as a catalyst and increases the effectiveness of other ingredients. The reason why you get instant relief from pain after using Steel Bite Pro is due to the presence of chicory root in the pills.
Bacteria result in bad odor and can create cavities in the teeth. Furthermore, some bacteria result in tooth decay and harm the gums. The celery seeds fight these bacteria and prevent further growth.
To stay healthy, the teeth need to absorb the minerals present in the saliva. When your teeth are damaged for any reason, they stop absorbing the minerals, and the damage continues further.
Yellow dock helps the teeth to absorb the minerals while reducing the inflammation. Various studies have proven the efficacy of yellow dock for teeth and gums, and it is a natural and effective ingredient to keep the teeth healthy.
Raspberry, Chanca Piedra, and Artichoke
These three natural ingredients have similar properties and contribute a lot to the effectiveness of Steel Bite Pro. The ingredients have good amounts of vitamins and minerals, including Vitamin K, Vitamin C, magnesium, phosphorus, and folate.
The purifying agents will remove bacteria and other impurities from the mouth so that the other ingredients work well by repairing the teeth and gums.
The worst thing about oral issues is the pain that you have to go through. Steel Bite Pro claims to help with the pain as it contains feverfew, which is a natural pain reliever. The ingredient suppresses oral and dental pain so you will feel better instantly.
As per a study, there are some other benefits of feverfew, because it is a medicinal plant that suppresses other pains as well. Also, there are no side effects of feverfew at all.
The root of the burdock plant comes loaded with antioxidants that improve the gum health and the overall health of your mouth.
The best thing about Steel Bite Pro is that the ingredients are present in exact quantities, so you can rest assured that there will be no side effects. Every ingredient is tested in the labs for its efficiency, and that's what makes the Steel Bite Pro a considerable option if you want to improve your oral and dental health.
How Does Steel Bite Pro Work?
It is crucial to understand how the supplement works so that you can decide whether to invest in it or not. Below is a step by step process that will help you understand Steel Bite Pro on the go.
When you start consuming the supplement, the pills break down in your mouth. The ingredients then mix with saliva to perform their particular actions.
The ingredients fight the bacteria and heal issues such as wounds while reducing the inflammation caused in the mouth.
The supplement cements the root of the teeth so that there are no further oral and dental issues. Also, it heals the gums and repairs the enamel to provide you relief from sensitivity.
The minerals present in these ingredients strengthen the crown area of the teeth while repairing the cracks so that the damage can be stopped.
The supplement also has some impact on your overall health as the ingredients detoxify the liver by flushing away the toxins.
Consuming the supplement regularly will help you maintain the shield on the teeth that fights against bacteria and microorganisms. Also, it improves the condition of the teeth and curtails bad breath.
The working of Steel Bite Pro is really simple, as there are no complex ingredients present in the supplement. It is easy to use, and all you have to do is consume the pill regularly to keep your oral and dental health up to the mark.
Benefits of Steel Bite Pro
There are many benefits of using Steel Bite Pro since it is an all-natural supplement that has no side effects at all. Here are some benefits you need to consider before buying it.
Prevents Bleeding and Improves Gum Health
The reason why your teeth bleed is due to the loose gums. The space between the tooth and the gum results in bleeding, and that's where Steel Bite Pro helps. The supplement tightens the gums so that there is no bleeding at all.
Whitens the Teeth Naturally
The ingredients present in the supplement, such as zinc and milk thistle, whiten the teeth naturally. There is no need to invest in expensive teeth whitening toothpaste if you are using Steel Bite Pro.
Reduces Bad Breath
The supplement contains ingredients that improve the overall health of the teeth, and it automatically reduces bad breath.
Helps Cure Tooth Pain
Steel Bite Pro has feverfew, which is a natural pain reliever ingredient. The ingredient cures tooth and gum pain and can have instant results after you consume Steel Bite Pro.
Side Effects of Using Steel Bite Pro
You may find it surprising, but Steel Bite Pro has no side effects at all as the supplement contains natural ingredients and has exact quantities so that there are no ill effects on your health. If you keep using the supplement as prescribed, then it can have some excellent results.
Who Should Refrain from Steel Bite Pro?
Steel Bite Pro is an all-natural dietary supplement to improve your dental and oral health.
Anyone can use the supplement, including pregnant women and breastfeeding mothers. There are no harms of using the supplement.
However, it would be great to consult a doctor before using the supplement to find out if you are allergic to any of the ingredients.
Dosage and Tips to Start
To get the most from Steel Bite Pro, you should consume two pills with water every day. Take both capsules together anytime that's convenient for you.
To get the best results, follow a brushing regime, and massage your teeth regularly with some good-quality oil to increase the effectiveness of the pills.
Where to Buy Steel Bite Pro, and Guarantees?
You can only buy Steel Bite Pro from the Official Site, as the supplement is not available anywhere else for purchase. You can choose from three available options:
●1 bottle (60 pills) $69
●Three bottles (180 pills) $117
●Six bottles (360 pills) $294 (Best Deal)
You get a 60-day money back guarantee with all the packages, no matter if you go for one bottle or six bottles. You are eligible to claim the full refund within 60 days of the date of purchase.
Steel Bite Pro Reviews: Closing Thoughts
After this definitive review, it will be easier for you to find out whether you should use Steel Bite Pro or not. The supplement contains a mix of 29 natural ingredients that have proven benefits and are tested in labs.
It is essential to get rid of oral and dental issues before things get out of control and you have no option left despite visiting a dentist.
Getting a good quality supplement is essential, so Steel Bite Pro is a viable option if you need a supplement with no side effects.
Anyone can use this supplement irrespective of age, sex, and medical conditions. Lastly, buy the supplement only from the official site so that you can easily claim the refund if required.
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By Heather Houser
Compost. Fly less. Reduce your meat consumption. Say no to plastic. These imperatives are familiar ones in the repertoire of individual actions to reduce a person's environmental impact. Don't have kids, or maybe just one. This climate action appears less frequently in that repertoire, but it's gaining currency as climate catastrophes mount. One study has shown that the reduction of greenhouse gas emissions from having one fewer child in the United States is 20 times higher—yes 2000% greater—than the impact of lifestyle changes like those listed above.
The Stickiness of Population<p>Only five years ago, there was minimal coverage of the child-free for climate movement. AOC is just one of many reasons it's lighting up now. New scientific analyses, scholarly debates, and social media conversations have shined a light on reproduction and climate. The influential <a href="https://www.drawdown.org/" target="_blank">Project Drawdown</a> framework for climate mitigation includes a list of solutions ranked by their potential impact, two of which—educating girls and providing access to family planning—they project will have <a href="https://www.drawdown.org/solutions/table-of-solutions" target="_blank">a greater combined impact</a> on reducing greenhouse gas emissions than almost all other climate solutions because of their effect on fertility rates.</p><p>In January 2020, <a href="https://academic.oup.com/bioscience/article/70/1/8/5610806" target="_blank">11,000 scientists signed onto a study that warned</a> about the unfolding climate emergency. The authors prescribe steps in six sectors that can prevent irreversible planetary collapse, including that "the world population must be stabilized—and, ideally, gradually reduced—within a framework that ensures social integrity." The framework they propose includes universal access to family planning as well as education and equity for young women. (Other <a href="https://doi.org/10.1073/pnas.1410465111" target="_blank" rel="noopener noreferrer">scientific takes</a> on population-based climate actions are more skeptical about their immediate impact given the scale of fertility reductions needed to balance out longer lifespans.)</p><p>Even before 2020, a new movement was afoot to address climate by forgoing reproduction. Blythe Pepino, a British musician in her 30s, formed BirthStrike in 2018 to build a community of people—typically women-identified—who have opted not to reproduce in response to the ecological and social crises that climate change is creating. In the wake of the Black Lives Matter protests this summer, the group recognized the need to acknowledge the oppression that colors conversations about reproduction as it relates to climate and so reformed itself into a support group for those grieving parenthood. Their new stated goal is to channel that loss into action on climate justice.</p><p>Organizations such as <a href="https://conceivablefuture.org/" target="_blank" rel="noopener noreferrer">Conceivable Future</a>, however, continue to keep reproduction at the fore. Led by climate activists Meghan Kallman and Josephine Ferorelli, Conceivable Future is raising awareness about how the climate crisis affects "<a href="https://conceivablefuture.org/about" target="_blank" rel="noopener noreferrer">intimate choices</a>" like reproduction. The Conceivable Future and now-defunct BirthStrike campaigns share ideological terrain with "<a href="https://www.npr.org/2016/08/18/479349760/should-we-be-having-kids-in-the-age-of-climate-change" target="_blank" rel="noopener noreferrer">population engineers</a>," a group of bioethicists who <a href="https://doi.org/10.5840/soctheorpract201642430" target="_blank" rel="noopener noreferrer">forward policies for</a> limiting the size of the global population through positive incentives like family planning classes and negative ones such as taxes on wealthy procreators. </p><p>In proposing specific policies rather than individual action, population engineers acknowledge the structures within which reproductive choices occur, everything from media influence to the tax code. Even with this shift to the structural, however, the racist, sexist, colonialist, and nativist legacies of the population question within environmentalism still plague child-free for climate. As do the historical and social injustices that constrain so-called choices.</p>
Racism and Xenophobia in Environmentalism<p>This summer and fall, the climate crisis and its correlated catastrophes—<a href="https://www.cbsnews.com/news/heat-wave-western-united-states/" target="_blank">extreme heat</a>, <a href="https://www.aljazeera.com/news/2020/07/14/a-third-of-bangladesh-underwater-after-heavy-rains-floods/" target="_blank">flooding</a>, <a href="https://www.theguardian.com/world/wildfires" target="_blank">wildfires</a>—are intensifying alongside Black Lives Matter uprisings and the <a href="http://www.yesmagazine.org/health-happiness/2020/06/09/coronavirus-public-health-social-justice/" target="_blank">coronavirus health disparities</a> among Black, Indigenous, and Latinx populations. This confluence has brought overdue attention to racism in environmentalism, as evidenced by the Audubon Society's recent <a href="http://audubon.org/magazine/fall-2020/revealing-past-create-future" target="_blank">reckoning</a> with racial injustices in its past and present, including <a href="https://www.audubon.org/news/the-myth-john-james-audubon" target="_blank">publicizing</a> that its famed founder was a White supremacist and a slaveholder. The intersections of <a href="https://www.yesmagazine.org/opinion/2020/09/23/election-black-voters-climate/" target="_blank">climate justice and racial justice</a> have also come to the fore through <a href="https://www.nytimes.com/2020/10/05/climate/heat-minority-school-performance.html" target="_blank">studies of how Black communities are greatly harmed by hotter temperatures</a> and through the popular <a href="https://www.intersectionalenvironmentalist.com/" target="_blank">intersectional environmentalist</a> platform created by Leah Thomas, a young Black activist and "<a href="https://www.greengirlleah.com/about-1" target="_blank">eco-communicator</a>." To these reckonings we need to add the racism and xenophobia that have long characterized environmentally motivated population controls.</p><p>The New York Times recently exposed these sins in <a href="https://www.nytimes.com/2019/08/14/us/anti-immigration-cordelia-scaife-may.html/" target="_blank">a profile of Cordelia Scaife May</a>, showing how this heir to the Mellon fortune converted a love of birding into a network of anti-immigration, pro-population-control organizations that still influence politics today. In the 1960s May linked threatened birdlife to the rapidly expanding human population. May wasn't wrong to see and worry over this link: A host of human activities—from <a href="https://www.smithsonianmag.com/science-nature/popular-pesticides-linked-drops-bird-population-180951971/" target="_blank" rel="noopener noreferrer">toxic agriculture and industry</a> to <a href="https://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.0050157" target="_blank" rel="noopener noreferrer">sprawling settlements</a> and <a href="https://www.npr.org/2017/10/05/555949789/light-pollution-can-impact-noctural-bird-migration" target="_blank" rel="noopener noreferrer">light</a> and <a href="https://www.mnn.com/earth-matters/animals/blogs/birds-live-near-human-noise-sing-louder-shorter-songs" target="_blank" rel="noopener noreferrer">noise pollution</a>—decimate avian habitats and habits. May's anti-immigration approach, however, indicates how readily environmentalism can mutate into racist and xenophobic actions.</p><p>The Times investigators show that "protecting natural habitats and helping women prevent unplanned pregnancies merged over time into a single goal of preserving the environment by discouraging offspring altogether." Taken on its own, this goal resonates with Conceivable Future's and population engineers' aims. To be clear, this does not mean that today's child-free climate advocates are racist nativists. However, it does indicate how readily the affiliation arises because of the ugly history of forced population control.</p>
Contemporary Examples<p>And this history is hardly past. For example, race and class conflicts erupted around a population platform within the Sierra Club only 15 years ago. In 2004, a faction of club members took a page from May and argued that more people living in the U.S. meant more encroachment on less developed land and water. As with May's effort, this anti-immigration push amounted to "the greening of hate," according to the Southern Poverty Law Center and Anti-Defamation League, who entered the dispute when they found White supremacists lobbying for anti-immigration Sierra Club board candidates. A 2010 <a href="https://www.splcenter.org/20100630/greenwash-nativists-environmentalism-and-hypocrisy-hate" target="_blank">SPLC report</a> firms up the connection between environmentalist intentions and racist agendas by explaining why White nationalist John Tanton infiltrated the club: "Using an organization perceived by the public as part of the liberal left would insulate nativists from charges of racism—charges that … would likely otherwise stick."</p><p>Charges of racism ultimately did stick to Tanton and his anti-immigration, pro-population-control allies. And they continue to stick in analyses of the child-free for climate movement today. Earlier this year, climate journalist Meehan Crist <a href="https://www.lrb.co.uk/the-paper/v42/n05/meehan-crist/is-it-ok-to-have-a-child" target="_blank">took up</a> AOC's question of whether it's OK to have a child. In arriving at an answer (for her, yes), she affiliates child-free positions with "anti-feminist, racist and anti-human" values and with bad science. "Darker visions" proceed from this analysis, she writes, visions of those who believe "racial purity will save the planet. Closed borders. . . . Ecofascist death squads." The dark visions Crist spins from the child-free for climate question underscore how readily calls for reproductive limits touch the third rails of modern environmentalism: racism, eugenics, xenophobia, even death-dealing.</p><p>We get even closer to these third rails when we consider that the question of whether to reproduce is, for some people, no choice at all. Modern efforts to limit fertility, which ramped up after World War II, have targeted poor women in the Global South, and Black, Indigenous, and people of color in the U.S. using coercion and force. BIPOC reproductive justice advocates such as Loretta Ross have condemned dichotomous pro-abortion-rights versus anti-abortion politics for producing "<a href="https://www.google.com/books/edition/Radical_Reproductive_Justice/hN-4DgAAQBAJ?hl=en&gbpv=1&dq=loretta%20ross%20radical%20reproductive&pg=PT8&printsec=frontcover&bsq=anemic" target="_blank" rel="noopener noreferrer">anemic political analyses</a>" that ignore the reality of forced sterilizations in prisons and the appallingly high maternal mortality rate for Black women in the U.S. These are all forms of what medical historian and ethicist Harriet Washington calls "<a href="https://www.youtube.com/watch?v=J8WCS1Rs8K8" target="_blank" rel="noopener noreferrer">medical apartheid</a>."</p>
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By Sharon Guynup
At this time of year, in Russia's far north Laptev Sea, the sun hovers near the horizon during the day, generating little warmth, as the region heads towards months of polar night. By late September or early October, the sea's shallow waters should be a vast, frozen expanse.
Comparison of autumn sea ice formation for the first half of October 2012 (the record year for Arctic sea ice extent loss) and in 2020 (second place for sea ice extent loss). The satellite record goes back to 1979. @Icy_Samuel, data provided by NSIDC
Arctic sea ice extent on Oct. 25, 2020 was at a record low 5.613 million square kilometers for this date, surpassing the record set in 2019 of 6.174 million square kilometers. ChArctic NSIDC
The Arctic appears to be changing into an entirely new climate state due to rapid warming. The extent of sea ice in the late summer, when it reaches its minimum each year, has already entered a statistically different climate, with surface air temperatures and the number of days with rain instead of snow also beginning to transition. Simmi Sinha, ©UCAR
A polar bear prowls the Arctic shoreline. VisualHunt.com
A fire burning through northern forest in Krasnoyarsk, Siberia, in July 2020. Greenpeace International
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By Peter A. Kloess
Picture Antarctica today and what comes to mind? Large ice floes bobbing in the Southern Ocean? Maybe a remote outpost populated with scientists from around the world? Or perhaps colonies of penguins puttering amid vast open tracts of snow?
Giants of the Sky<p>As their name suggests, these ancient birds had sharp, bony spikes protruding from sawlike jaws. Resembling teeth, these spikes would have helped them catch squid or fish. We also studied another remarkable feature of the pelagornithids – their imposing size.</p><p>The largest flying bird alive today is the <a href="https://www.nationalgeographic.com/animals/birds/group/albatrosses/" target="_blank">wandering albatross</a>, which has a wingspan that reaches 11 ½ feet. The Antarctic pelagornithids fossils we studied have a wingspan nearly double that – about 21 feet across. If you tipped a two-story building on its side, that's about 20 feet.</p><p>Across Earth's history, very few groups of vertebrates have achieved powered flight – and only two reached truly giant sizes: birds and a group of <a href="https://www.amnh.org/exhibitions/pterosaurs-flight-in-the-age-of-dinosaurs/what-is-a-pterosaur" target="_blank" rel="noopener noreferrer">reptiles called pterosaurs</a>.</p>
Full-size model of a Quetzalcoatlus on display at JuraPark in Baltow, Poland. Aneta Leszkiewicz / Wikimedia<p>Pterosaurs ruled the skies during the Mesozoic Era (252 million to 66 million years ago), the same period that dinosaurs roamed the planet, and they reached hard-to-believe dimensions. <a href="https://www.wired.com/2013/11/absurd-creature-of-the-week-quetz/" target="_blank" rel="noopener noreferrer">Quetzalcoatlus</a> stood 16 feet tall and had a colossal 33-foot wingspan.</p>
Birds Get Their Opportunity<p>Birds originated while dinosaurs and pterosaurs were still roaming the planet. But when an <a href="https://www.smithsonianmag.com/science-nature/dinosaur-killing-asteroid-impact-chicxulub-crater-timeline-destruction-180973075/" target="_blank">asteroid struck the Yucatan Peninsula 66 million years ago</a>, dinosaurs and pterosaurs both perished. Some <a href="https://www.audubon.org/news/how-birds-survived-asteroid-impact-wiped-out-dinosaurs" target="_blank">select birds survived</a>, though. These survivors diversified into the thousands of bird species alive today. Pelagornithids evolved in the period right after dinosaur and pterosaur extinction, when competition for food was lessened.</p><p><a href="https://doi.org/10.1002/spp2.1284" target="_blank">The earliest pelagornithid remains</a>, recovered from 62-million-year-old sediments in New Zealand, were about the size of modern gulls. The first giant pelagornithids, the ones in our study, <a href="https://doi.org/10.1038/s41598-020-75248-6" target="_blank" rel="noopener noreferrer">took flight over Antarctica about 10 million years later</a>, in a period called the Eocene Epoch (56 million to 33.9 million years ago). In addition to these specimens, fossilized remains from other pelagornithids have been found on every continent.</p><p>Pelagornithids lasted for about 60 million years before going extinct just before the Pleistocene Epoch (2.5 million to 11,700 years ago). No one knows exactly why, though, because few fossil records have been recovered from the period at the end of their reign. Some paleontologists cite <a href="https://doi.org/10.1080/02724634.2011.562268" target="_blank" rel="noopener noreferrer">climate change as a possible factor</a>.</p>
Piecing it Together<p>The fossils we studied are fragments of whole bones collected by paleontologists from the University of California at Riverside in the 1980s. In 2003, the specimens were transferred to Berkeley, where they now reside in the <a href="https://ucmp.berkeley.edu/" target="_blank" rel="noopener noreferrer">University of California Museum of Paleontology</a>.</p><p>There isn't enough material from Antarctica to rebuild an entire skeleton, but by comparing the fossil fragments with similar elements from more complete individuals, we were able to assess their size.</p>
In life, the pelagornithid would have had numerous 'teeth,' making it a formidable predator. Peter Kloess, CC BY-NC-SA
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