NO NEED FOR MILLION DOLLAR LOTTERIES

Even a $25 cash card can motivate some to get vaccinated

by Cara Murez

Can offering small cash cards, say for $25, be the difference between someone choosing to get their COVID-19 vaccine or waiting?

Yes, according to a study in North Carolina that offered $25 cash cards to people who got vaccines last spring at sites in four participating counties.

About 9% of those surveyed after getting their vaccines said that they would not have come to get vaccinated if it were not for the cash card. About 15% said they had waited to get a vaccine until they found an event with an incentive.

"We were really interested in North Carolina and at the Department of Health and Human Services to use multiple strategies to help North Carolinians get vaccinated as quickly and fairly as possible," said study author Dr. Charlene Wong. She is chief health policy officer for COVID-19 of the North Carolina Department of Health and Human Services.

"We actually planned the evaluation of this pilot incentive program from the very beginning because we knew that we wanted to better understand what was working, what we might want to modify, as we thought about scaling this program to other places in the state, as well as other strategies to increase vaccinations in North Carolina," Wong said.

Public health officials added a twist to the program: paying $25 to both the vaccine recipient and the person who drove them to the event, though not two $25 cards if people drove themselves.

Paying the driver may have reduced transportation barriers for some. It also may have encouraged the types of one-to-one conversations with people who are known and trusted by those who still needed to get vaccinated, Wong said.

"We were very intentional about doing that because we knew that for some individuals in North Carolina there were real transportation barriers to be able to get to a vaccine site," Wong said.

In designing its incentives and evaluation of their success, public health officials looked back at past behavioral science research, including incentives offered for other vaccinations and cancer screenings, Wong said.

Guaranteed incentives can offset costs, such as lost wages, transportation and child care, according to the study.

Different types of incentives may make a difference for individuals. Tickets to an amusement park may have been influential for people with kids, for example, Wong said.

In particular, these small incentives helped address cost barriers to vaccinations for historically marginalized populations, including those who are lower income, Hispanic and Black, Wong noted.

"We were so pleased to see that. And that was why, that was certainly part of the reason that we wanted to do these surveys so that we could actually really look down to that level of equity so that we could better understand for whom was this important and was it really helping to address some of these barriers," Wong said.

The program distributed 2,890 cash cards to vaccine recipients and another 1,374 to drivers. The incentive program offered different amounts of money at times. The researchers found the rate of decline in vaccine uptake, at a time when numbers were declining across the country, was halved in places that had these incentives.

The findings were published online Oct. 25 in JAMA Internal Medicine.

Now, in North Carolina, about 71% of adults have received at least one dose of one of the three approved COVID-19 vaccines. In the United States, about 77.4% of eligible ages (12 and up) had received at least one dose of the vaccine by Oct. 21 and about 66.9% were fully vaccinated, according to the U.S. Centers for Disease Control and Prevention.

Mitch Rothholz, chief of staff for the American Pharmacists Association, which was not involved in this study, wondered if the incentive for drivers may have made the difference in vaccine uptake in the North Carolina program.

Sometimes, incentives have backfired because people have been suspicious of their intent, Rothholz said.

"I think every individual has different perspectives that's going to motivate them to get vaccinated. We found it's really an individual decision," Rothholz said. "In the work we've done on vaccine confidence, a lot of it has also been the relationship and the discussions that they've had with other individuals that they respect in their community, like their pharmacist."

It can take several interactions—while listening, providing information and being nonjudgmental—for someone to decide to get vaccinated, Rothholz said.

In its research profiling who was still unvaccinated in late May, the Kaiser Family Foundation (KFF) determined that unvaccinated adults were younger, less educated, more likely to be Republican, people of color and those who did not have health insurance.

The key demographic differences between the "definitely not" and "wait-and-see" groups were racial and ethnic identity and political partisanship, according to the foundation, with the definitely nots having a larger number of people who were white and considered themselves to be Republican and the waiting group being more diverse, with about half of all those included being people of color.

By September, KFF found that more than seven in 10 adults reported being at least partially vaccinated, across racial and ethnic groups. It continued to find large gaps in vaccine use by partisanship, education level, age and health insurance status.

Various incentives, including time off work to recover from a vaccine or paid transportation, were effective in moving the wait-and-see group, said Ashley Kirzinger, associate director of public opinion and survey research at KFF. She also noted that these programs do seem to have helped with vaccine equity.

"I think it's important to realize that these kind of incentive programs can move the needle, especially in populations that are more open to getting a vaccine but are facing access issues, but we haven't found any evidence that it's going to persuade the most resistant populations," Kirzinger added.

Mortality study reinforces safety of COVID-19 vaccinations

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More information: The U.S. Centers for Disease Control and Prevention has more on COVID-19 vaccines.

Charlene A. Wong et al, Guaranteed Financial Incentives for COVID-19 Vaccination, JAMA Internal Medicine (2021). DOI: 10.1001/jamainternmed.2021.6170

Journal information: JAMA Internal Medicine 

Copyright © 2021 HealthDay. All rights reserved.

 

Green tea catechins promote oxidative stress

by Peter Rüegg, ETH Zurich

Credit: Unsplash/CC0 Public Domain

Green tea is seen as healthy and promotes a longer life, supposedly due to its high level of antioxidants. Researchers at ETH Zurich have now cast doubt on previous assumptions about how these ingredients work.

Green tea has long been known to have health benefits. In particular, it contains catechins called ECG and EGCG that are said to prolong life. These two substances belong to the group of polyphenols. They are considered antioxidants, which means they counteract or prevent oxidative stress in the body caused by aggressive free radicals of oxygen.

Until now, research has assumed that the catechins neutralize these free radicals and thus prevent damage to cells or DNA. One source of oxygen free radicals is metabolism; for example, when the mitochondria—the powerhouses of the cell—are working to produce energy.

ETH researchers led by Michael Ristow, Professor of Energy Metabolism at the Department of Health Sciences and Technology at ETH Zurich, together with colleagues from the University of Jena, have now taken a closer look at how catechins act in the nematode worm C. elegans. And they have come to a different, seemingly paradoxical conclusion: Rather than suppressing oxidative stress, the catechins in green tea promote it.

Temporary increase in oxidative stress

In a study just published in the journal Aging, Ristow's team shows that these polyphenols from green tea initially increase oxidative stress in the short term, but that this has the subsequent effect of increasing the defensive capabilities of the cells and the organism. As a result, the catechins in green tea led to longer life and greater fitness in nematodes that were fed them.

"That means green tea polyphenols, or catechins, aren't, in fact, antioxidants, but rather pro-oxidants that improve the organism's ability to defend itself, similar to a vaccination," explains study leader Ristow.

However, this increase in defensive capability manifests not through the immune system, but rather by activating genes that produce certain enzymes such as superoxide dismutase (SOD) and catalase (CTL). It is these enzymes that inactivate the free radicals in the nematode; they are essentially endogenous antioxidants.

Sport and calorie reduction have a similar effect

Ristow isn't surprised to see this kind of mechanism at work. His research group showed back in 2009 that the reason sport promotes health is because sporting activities increase oxidative stress in the short term, thus improving the body's defenses. Consuming fewer calories has the same effect, as has been shown several times in animals. Mice fed a reduced-calorie diet live longer than those fed a normal, high-calorie diet. "So it made sense to me that the catechins in green tea would work in a similar way," Ristow explains.

He goes on to say that the findings from this study translate well to humans. The basic biochemical processes by which organisms neutralize oxygen free radicals are conserved in evolutionary history and are present in everything from unicellular yeast to humans.

Green tea yes, concentrates no

Ristow himself drinks green tea every day, a practice he recommends. But he advises against taking green tea extracts or concentrates. "At a certain concentration, it becomes toxic," he says. High-dose catechins inhibit mitochondria to such an extent that cell death ensues, which can be particularly dangerous in the liver. Anyone consuming these polyphenols in excessive doses risks damaging their organs.

While the most catechins are to be found in Japanese varieties of green tea, other green teas also contain sufficient amounts of these polyphenols. Black tea, on the other hand, contains a much lower level of catechins, since these are largely destroyed by the fermentation process. "That's why green tea is preferable to black tea," Ristow says.

Is green tea a fad or a real health boost?

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More information: Jing Tian et al, Green tea catechins EGCG and ECG enhance the fitness and lifespan of Caenorhabditis elegans by complex I inhibition, Aging (2021). DOI: 10.18632/aging.203597

Provided by ETH Zurich 

New study finds black spruce trees struggling to regenerate amid more frequent arctic fires

The resulting ecological shift could have rippling impacts on the boreal region, including acceleration of permafrost thaw and loss of biodiversity.

Peer-Reviewed Publication

WOODWELL CLIMATE RESEARCH CENTER

A new study, published in the Proceedings of the National Academy of Sciences (PNAS), finds that black spruce trees — a key species on the boreal landscape for millennia — are losing their resilience and capacity to regenerate in the face of warming temperatures and increasingly frequent Arctic wildfires. A continuation of this trend could result in a landscape-wide ecological shift that would have a complex and rippling impact on the region, including an acceleration in permafrost thaw, and a loss of valuable biodiversity. 

In boreal North America, the thick, spongy soils on which black spruce grows are made of peat moss and lichens that retain moisture very well but when they do dry out are highly flammable. Black spruce rely on fires for regeneration — their cones open up in the heat and drop seeds onto the charred organic soil — but this latest study indicates that more severe fires that burn deeper into these peat soils are leading to a short-circuit of the regeneration process. 

In synthesizing data from more than 1500 fire-disturbed sites, researchers found that black spruce’s ability to regenerate after fire dropped at 38% of sites and failed completely 18% of the time — numbers never before seen in a species evolved to thrive after fire. Significant shifts in wildfire regimes are pushing black spruce forests to a tipping point, beyond which the iconic species may lose its place as the dominant tree species in boreal North America.

“This trend is especially alarming given its potential impact on Arctic carbon storage,” said Dr. Brendan Rogers, Associate Scientist at Woodwell Climate Research Center and study co-author. “In many parts of the boreal region, the mossy soil layers that promote black spruce regeneration also insulate permafrost. As fires increase and these forests dry out, however, loss of black spruce forests could accelerate permafrost thaw and trigger a warming feedback loop, pushing black spruce to its tipping point and facilitating the release of massive amounts of carbon from the permafrost into the atmosphere.”

Widespread loss of black spruce also has implications for biodiversity, particularly caribou species that overwinter in the forest and feed on lichen. Both barren-ground and boreal caribou, important cultural species for northern communities, are already in decline across the continent and would suffer more losses if the ecosystem shifts away from the black spruce-lichen forests that provide food and refuge.

“Basically, as the climate warms, rising Arctic temperatures are causing black spruce forests to dry out, and the drier the system is, the more vulnerable it is to fire,” said Dr. Jennifer Baltzer, Canada Research Chair in Forests and Global Change at Wilfrid Laurier University and study lead. “As climate change continues to push these systems to an ever drier state, these tipping points are more likely to be reached, with devastating impacts on the boreal biome and the rest of the world.”

 

About Woodwell Climate Research Center: 

Woodwell Climate Research Center is an organization of renowned researchers who work with a worldwide network of partners to understand and combat climate change. We bring together hands-on experience and 35 years of policy impact to develop societal-scale solutions that can be put into immediate action. Our Falmouth, MA headquarters are located on the traditional and sacred land of the Wampanoag people who still occupy this land, and whose history, language, traditional ways of life, and culture continue to influence this vibrant community. Woodwell Climate has earned Charity Navigator’s highest rating of 4 stars, as well as a Gold Seal of Transparency from GuideStar.

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JOURNAL

Proceedings of the National Academy of Sciences

SUBJECT OF RESEARCH

Not applicable

ARTICLE TITLE

Increasing fire and the decline of fire adapted black spruce in the boreal forest

ARTICLE PUBLICATION DATE

25-Oct-2021

Researchers evaluate and identify consistent indicators to support sustainability on U.S. ranches

Standardized ecological, social and economic indicators can help ranchers track and communicate about sustainability.

Peer-Reviewed Publication

POINT BLUE CONSERVATION SCIENCE

Livestock grazing on well-managed rangelands can help secure clean water, enhance habitat, address climate change, and sustain rural communities. Ensuring the sustainability of livestock agriculture is not only vital to feeding a growing world, but it’s essential to a healthy future, which is why a research team led by The Nature Conservancy (TNC) and World Wildlife Fund (WWF) set out to help ranchers more consistently measure, manage, and communicate about the sustainability of their operations. The 20-person team produced a study detailing 20 core indicators commonly used to support ranch-level sustainability.

The study, “A Synthesis of Ranch-Level Sustainability Indicators for Land Managers and to Communicate Across the U.S. Beef Supply Chain,” was recently published in Rangeland Ecology & Management.

Rangelands span some 770 million acres across the United States. As the stewards of such a vast area of land, cattle ranchers need to be equipped with the tools necessary to measure, manage, and communicate the sustainability of their ranches, especially given the increasing commitments by food companies and demand by consumers to advance sustainability across the beef supply chain.

“There’s increasing interest and effort among multiple beef supply chain players to measure and track sustainability at the ranch level, but there’s currently a lack of uniform measurements,” said Patrick Lendrum with World Wildlife Fund’s Northern Great Plains Program.  “To effectively track sustainability in the U.S. beef industry, notably one of the most complex food systems in the world, we need common indicators that are actionable on the ground, measure progress toward sustainability goals of companies and consumers, and enable ranchers to consistently communicate improvements to their operations.”

Taking steps toward this goal, the researchers focused on summarizing commonly used ecological, social, and economic indicators that could inform adaptive management toward enhanced sustainability.  They evaluated 21 range and pastureland assessments from organizations, agencies, and academics that totaled 180 indicators. From this, the team selected 20 commonly used “core” indicators (12 ecological and 8 socioeconomic), which are designed to detect change over time for management practices, are common among many approaches, and/or are critical for outcomes of common interest to producers, companies, and consumers. While these indicators are relevant for rangelands across the United States, they may be measured differently in different parts of the country, due to regional variabilities.

“We found consistent ecological indicators that rose to the top, but we also found less emphasis on the economic and social indicators in current frameworks, which are equally important when striving to achieve a sustainable operation,” said Marissa Ahlering, Ph.D., lead scientist with The Nature Conservancy in Minnesota, North Dakota and South Dakota.  “We do, however, recognize that social and economic indicators – such as community health and income – include much more sensitive and context-dependent information, thus presenting a greater challenge.” Only 5 of the 21 assessments reviewed included socioeconomic indicators

More consistently used and agreed upon indicators spanning ecological, social and economic interests will lead to a better understanding of sustainability at the ranch level, which in turn would better equip ranchers with the information necessary to communicate how they are making progress toward sustainability goals in their own operations.

 “Ranching is a complex business.  Thriving in that business, particularly for any rancher who relies on the ranch for a livelihood, requires close attention to every detail.  And the most fundamental detail is that of rangeland health,” said Mickey Steward of Seacross Ranch in Lodge Grass, Montana. “Constant monitoring, both formal and informal, is necessary to ensure that ecological health across the spectrum of plant and wildlife communities, soil, and hydrology is constantly improving. Drought resilience and every aspect of sustainability depend on the keen eye of the rancher buttressed by data collection and analysis on many levels.  And, as with any other endeavor, documentation is essential to understanding and applying the knowledge gained from unceasing observation and application of the results of that observation,” Steward said.

Grazing has the largest footprint of any agricultural activity, making it imperative that producers can track and manage these lands for clean water, climate and biodiversity benefits, social and economic outcomes. By developing a consistent standardized set of sustainability indicators to measure on-ranch progress, determine adaptive management strategies, and communicate results is an essential first step to ensuring that ranchers, companies and consumers are closer to achieving their sustainability goals.

Additional co-authors on the paper include Clare Kazanski, Pablo Borrelli, William Burnidge, Lexi Clark, Chad Ellis, Kirk Gadzia, Jonathan Gelbard, Sasha Gennet, Jeff Goodwin, Jeffrey E. Herrick, Emily Kachergis, Corrine Knapp, Nancy Labbe, Kristie Maczko, Elizabeth Porzig, David Rizzo, Sheri Spiegal, and Christopher Wilson. 

# # #

About The Nature Conservancy

The Nature Conservancy is a global conservation organization dedicated to conserving the lands and waters on which all life depends. Guided by science, we create innovative, on-the-ground solutions to our world's toughest challenges so that nature and people can thrive together. We are tackling climate change, conserving lands, waters and oceans at an unprecedented scale, providing food and water sustainably and helping make cities more sustainable. Working in 72 countries, we use a collaborative approach that engages local communities, governments, the private sector, and other partners. To learn more, visit www.nature.org or follow us on Twitter at @nature_press.

About World Wildlife Fund (WWF)

WWF is one of the world’s leading conservation organizations, working for 60 years in nearly 100 countries to help people and nature thrive. With the support of more than 5 million supporters worldwide, WWF is dedicated to delivering science-based solutions to preserve the diversity and abundance of life on Earth, halt the degradation of the environment, and combat the climate crisis. Visit worldwildlife.org to learn more; follow @WWFNews on Twitter to keep up with the latest conservation news; and sign up for our newsletter and news alerts here.

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JOURNAL

Rangeland Ecology & Management

DOI

10.1016/j.rama.2021.08.011 

METHOD OF RESEARCH

Systematic review

SUBJECT OF RESEARCH

Not applicable

ARTICLE TITLE

A Synthesis of Ranch-Level Sustainability Indicators for Land Managers and to Communicate Across the U.S. Beef Supply Chain

ARTICLE PUBLICATION DATE

25-Oct-2021

 

Google takes up to 42% from ads, states say in antitrust case

by Bob Van Voris

Credit: CC0 Public Domain

Google takes up to 42% of the money paid for digital ads published online, according to a newly unsealed court filing by states that claim the search and advertising giant abuses its monopoly power in online advertising to limit competition and harm consumers.

The Alphabet Inc. unit runs the biggest electronic marketplace in the world, according to the states, processing 11 billion online ad spaces every day through its AdX exchange.

"More daily transactions are made on AdX than on the NYSE and NASDAQ combined," a group of 16 states and Puerto Rico said in their complaint, saying they were quoting "Google's own words."

The document was filed in August, with redactions to shield information that could be commercially sensitive. It was refiled in a mostly unredacted form Friday, after a judge in Manhattan ruled last week that most of the material should be publicly available.

"Google now uses its immense market power to extract a very high tax of 22 to 42% of the ad dollars otherwise flowing to the countless online publishers and content producers such as online newspapers, cooking websites, and blogs who survive by selling advertisements on their websites and apps," the states said in the unredacted filing.

The lawsuit, filed by a group of states led by Texas, is one of four government antitrust complaints against Google. The Justice Department and a different group of states have sued Google in separate cases over its dominance in Internet search, while another state case was filed this year over Google's Android mobile operating system.

The case is: In re Google Digital Advertising Antitrust Litigation, 21-md-03010, U.S. District Court, Southern District of New York (Manhattan).

California to bring antitrust lawsuit against Google

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©2021 Bloomberg L.P.
Distributed by Tribune Content Agency, LLC.

Research reveals powerful lure of gambling adverts on social media to children

by University of Bristol

Credit: Unsplash/CC0 Public Domain

A new report has exposed how children and young people are vulnerable to the growing popularity of gambling adverts on social media, prompting calls from leading experts for much tighter regulations.

The research, published today as part of a policy briefing led by the University of Bristol, found gambling advertising is vastly more appealing to children than adults.

Most notably, the study findings showed disguised gambling marketing and ads for betting on esports—professional online competing in computer games—were nearly four times more appealing to children than adults. It also revealed nearly half of children are exposed to such advertising weekly and around a quarter encounter it daily.

Whereas results showed the vast majority of adults were wary or annoyed when faced with gambling ads, children mainly reacted positively.

Co-lead investigator Dr. Raffaello Rossi, who is conducting first-of-its-kind research into the use and impact of gambling advertising on social media, said: "The overwhelming strong appeal of gambling advertising on social media to children is of huge concern, as it is known the earlier people start gambling the more likely it will become habitual and problematic.

"That's why there needs to be much stricter and clearer rules in place to clamp down on the issue, which could easily spiral out of control given how long children and young people spend on social media these days. Many of the adverts may look entirely innocent and harmless, but they in fact pose a serious risk of getting a whole new generation of gamblers hooked on a serious addiction which has devastating consequences."

The report, in light of its findings and previous studies, is calling for:

• Esports gambling advertising, which automatically appeals to children and young people, to be banned.
• Gambling content marketing, which masquerades as something appealing, to be rigorously regulated and informed by what is proven to attract young people.
• Regulators to broaden the age range of a 'young person' from 16–17 to 16- to 24-year-olds.
• Social media platforms to only allow gambling ads on social media when users actively opt-in to receive them.

The report comes as the Gambling Act is currently being reviewed by the government, and the Committee of Advertising Practice (CAP) has launched a consultation to better protect children from gambling advertising which appeals to them.

Although Advertising Standards Authority (ASA) codes currently forbid gambling advertising from being of 'particular appeal to children and young persons," there are no previous investigations into what exactly appeals to them. While adverts using cartoons may be banned on such grounds, the research findings showed posts featuring cartoons were least appealing to children and the most appealing ads, which were more subtle, would not breach regulations.

This study surveyed online 210 children aged 11 to 17 years, 222 young people aged 18 to 24, and 221 adults aged 25 to 78 years in the UK from May to July last year.

It showed nearly half (45.2 percent) of children and almost three-quarters of young people (72.4 percent) saw gambling advertising on Twitter at least once a week. A quarter of children (25.2 percent) and more than a third (37.3 percent) of young people reported seeing it daily.

Findings also revealed the vast majority of gambling ads on Twitter (19 out of 24) were twice as likely to appeal to children and young people than older adults, with young people reacting most favorably. While nearly two-thirds (15 out of 24) gambling adverts prompted positive emotions for young people, such as excited, happy, or delighted, less than a third (seven out of 24) resulted in a positive emotional response among adults. By contrast, adults were found to be four-times more likely to react negatively, feeling distress, anger, or tension when exposed to gambling ads.

These trends were most pronounced with gambling content marketing, which was found to be nearly four-times more appealing to children and young people than adults with almost all the ads (11 out of 12) triggering positive emotions in children and young people, compared to less than half of them (seven out of 12) doing so for adults.

Esports gambling adverts were also found to be much more appealing to children and young people than adults, who were shown to be four-times more likely to feel extremely negative emotions about the ads than children.

Co-lead investigator Agnes Nairn, Professor of Marketing at the University of Bristol's School of Management, said: "We know from previous research that children are actively following and engaging with gambling content on social media and regulators are struggling to keep up with this trend. This new research shines a spotlight on two specific types of gambling adverts: content marketing and esports that are strongly and significantly more appealing to children and young people than to older adults.

"Importantly, the current regulations do not address these types of advertising at all. The esports market is forecast to exceed a billion dollars this year. It has an audience of 500 million people, most of them children and young people. The regulations need to be reformed as a matter of urgency."

The Young Gamers and Gamblers Education Trust (YGAM), a leading UK gambling-harm prevention charity, provides a range of education programs, working with thousands of schools and youth practitioners to help engage with and safeguard future generations against gambling harms.

Kev Clelland, Strategic Alliance Director at YGAM, said: "A key part of our programs focus on gambling advertising, as well as the growth of esports, and this latest research will further inform our evidence-led resources. The findings support the evidence we submitted to the Gambling Act Review where we called for more to be done to minimize the exposure that children have to gambling advertising. All gambling advertising should be designed and displayed in a way that is appropriate for adults and avoids marketing techniques that appeal to children. There is opportunity to strengthen advertising protections and both the advertisers and the platforms which host adverts should use technology and data to do more."

Personalised gambling adverts: A troubling new trend

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More information: What are the odds? The appeal of gambling adverts to children and young persons on Twitter. www.bristol.ac.uk/policybristo … s/what-are-the-odds/

Provided by University of Bristol 

 

Study finds that social justice and health issues impact electric vehicle uptake

by University of Cambridge

Credit: CC0 Public Domain

A new study led by the University of Cambridge and based on public attitudes expressed in 36,000 Facebook posts, has found that consumer uptake of electric vehicles (EVs) can be boosted by promoting the social justice and health aspects of the technology.

The researchers found that effective communication of social and health benefits of EV ownership can be a motivating factor for influencing higher EV uptake.

The study, published in the journal Renewable and Sustainable Energy Reviews, analyzed Facebook postings in the United States related to EVs, using machine learning based on a PESTLE (Political, Economic, Social, Technological, Legal and Environmental) framework that examines the intersection of various words and phrases.

"Social media offers a treasure trove of information to better understand how the public views the energy transition from carbon-emitting internal combustion engine to EVs," said study co-author David Reiner from Cambridge Judge Business School.

Reiner and his collaborators used machine learning and social network analysis to identify via Facebook posts what aspects people valued in electric vehicles, and found that social justice, clean air, better health and a shift toward EVs becoming a service industry emerged as key themes.

The social justice theme was quite pervasive in the researchers' findings. One important discourse that shaped EVs' social justice and welfare dimensions was centered around the idea that 'We all can benefit from more electric vehicles', as this links to environmental benefits like cleaner air, less pollution, climate change mitigation, and better health for all. There was also broad agreement on the need for state support to make EVs more affordable.

"While governments around the world have launched aggressive targets for EVs, increasingly through regulatory measures rather than direct subsidies, there has been little academic research into the drivers of EV adoption," said Reiner. "This new study helps fill that knowledge gap, and can be a useful tool for energy policymaking in this vital area."

Breaking down the PESTLE framework, the study found that Facebook posts relating to Political aspects were most related to EV tax and subsidies; posts on the Economy focused on consumer fees and EV market expansion; the Social dimension centered on job creation, investment and clean air; Technology posts centered around charging and batteries; while Legal and Environmental posts looked mostly at climate change and EV-related sustainability discussion.

The 36,000 Facebook public posts on EVs that were analyzed, all posted in 2020, generated a text corpus of 600,000 words or terms that formed the data for the study's topic modeling.

As car manufacturers consider the potential for EVs as a subscription-based service, the study also underlines the importance of understanding how EVs are now being adopted at a community level as this will influence the future design of subscription-based and shared ownership schemes.

EV sales exceeded 2.1 million globally in 2019, with 90% of sales in China, Europe and the U.S., the study observes, with sales of all-electric light-duty vehicles in the U.S. growing from zero in 2010 to 242,000 in 2019.

Social media analysis shows support for public health measures

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More information: Ramit Debnath et al, Political, economic, social, technological, legal and environmental dimensions of electric vehicle adoption in the United States: A social-media interaction analysis, Renewable and Sustainable Energy Reviews (2021). DOI: 10.1016/j.rser.2021.111707

Provided by University of Cambridge 

 

From waste to resource: Turning exhaust heat into energy with unprecedented efficiency

by DGIST (Daegu Gyeongbuk Institute of Science and Technology)

Credit: CC0 Public Domain

Thanks to the ongoing digital revolution, we are on the verge of transitioning to a hyper-connected world. However, the Internet-of-Things (IoT) devices and remote sensors that promise such a reality require energy. With sustainability as a top priority, the energy source must be abundant, ubiquitous, and renewable. Fortunately, low-grade waste heat (temperatures below 100 °C) could fit the bill provided we develop efficient energy harvesting technologies.

The conversion of a temperature difference into electricity is already possible through thermoelectrochemical cells (TECs). These devices can leverage waste heat to sustain a reduction–oxidation (redox) reaction that, in turn, produces electricity. However, current state-of-the-art TECs are lacking commercial implementations due to their low energy conversion efficiency, lackluster output power, and costly fabrication. A breakthrough in energy conversion is, therefore, needed for TECs to become viable for untethered low-power devices.

Against this backdrop, a team of scientists at Daegu Gyeongbuk Institute of Science and Technology (DGIST), Korea, devised an effective strategy to take it up a notch. Led by Professor Hochun Lee, these researchers combined the operating principle of TECs with that of concentration galvanic cells, creating a hybrid thermoelectrochemical-concentration cell (TCC). Although TCCs are not a new concept, the design put forward by the team overcomes some critical limitations of existing TECs.

The TCC reported in this study, which was published in the Chemical Engineering Journal, is based on redox reactions involving iodine ions (I−) and triiodide (I3−). Unlike in conventional TECs, however, these reactions occur in a non-aqueous carbonate solution that uses dimethyl carbonate (DMC) as a solvent. This particular selection of materials creates a peculiar effect.

The researchers found that as the temperature of the hot side increased beyond 40 °C, the DMC reacted with I− to produce a porous, gel-like layer of Li2CO3 near the hot electrode that helped maintain a large difference in the concentrations of I− and I3− throughout the cell, greatly boosting its performance. "Our hybrid cell demonstrates a remarkable thermal conversion efficiency (5.2%) and outperforms the current best n-type TECs," says Prof. Lee. "In addition, the simple structure and fabrication process of our TCCs offer a practically feasible platform for thermal energy harvesting."

Further studies will be needed to refine this unprecedented approach to TCC design and, hopefully, achieve the goal of connecting multiple TCCs in series to reach commercially acceptable capabilities. "IoT-connected societies will require economic and autonomous power sources for their IoT devices and sensors, and we believe TECs will be the ideal candidate to meet their need," concludes an optimistic Prof. Lee.

Hopefully, science will lead us to sustainable and more efficient ways to make good use of waste heatSpace energy technology restored to make power stations more efficient

More information: Kyunggu Kim et al, Hybrid thermoelectrochemical and concentration cells for harvesting low-grade waste heat, Chemical Engineering Journal (2021). DOI: 10.1016/j.cej.2021.131797

Provided by DGIST (Daegu Gyeongbuk Institute of Science and Technology)

 

Fossil rivers of the Sahara tell of the threat of warming

by University of Geneva

A satellite image shows the morphologies of fossil rivers in southern Egypt. This study 

shows that these rivers were intensely active during the African wet period. 

Credit: Esri World Imagery

Why did the people living near the Nile river migrate to central Egypt 10,000 years ago, when the Egyptian Sahara was still green? Geologists led by the University of Geneva (UNIGE), Switzerland, have studied the fossil rivers north of Lake Nasser in Egypt in order to reconstruct the palaeo-hydrology of the region and to determine the rainfall rate of this African humid period. They found that following a rapid temperature increase of about 7°C, the frequency of heavy rainfall events increased fourfold, increasing river flooding and forcing riverine populations to migrate to the center of the country. These results, to be read in the journal Quaternary Science Reviews, highlight the increase in extreme weather episodes in the event of global warming.

Africa experienced a wet period between 14,800 and 5,500 BC, characterized by a still green Sahara. However, this region north of Lake Nasser in Egypt is now arid, leaving only fossilized rivers as traces of this green past. "These rivers are essential for reconstructing past climates, as they allow us to determine the quantities of flowing water at the time, as well as the quantities and frequencies of rainfall," explains Abdallah Zaki, a Ph.D. researcher in the Department of Earth Sciences at the UNIGE Faculty of Science and first author of the study.

Reconstructing river discharge to obtain precipitation rates

To reconstruct the palaeo-hydrology of a region, it is first necessary to measure the pebbles in the fossil rivers. "Large pebbles indicate a high water discharge, capable of transporting them, as do the depth and width of the river, which make it possible to assess the water discharge, for instance in units of cubic meters per second," says Sébastien Castelltort, associate professor in the Department of Earth Sciences and final author of the study. The second step is to find out the surface area of the drainage basin, i.e. the area that connects the water upstream to the river. "By combining these two figures, we obtain the precipitation rate responsible for transporting the studied sediments," continues the Geneva researcher.

To find the age of the rivers, the scientists use two different techniques. The first, carried out in collaboration with ETH Zurich, uses carbon-14 dating of the organic matter that fills the fossilized rivers. The second, called Optically Stimulated Luminescence and carried out with specialists from the University of Lausanne, consists of measuring the luminescence of quartz to obtain the age of the sediment deposit.

A sharp increase in intense rainfall

The scientists carried out this work on six rivers in the region and confirmed that the rivers were mainly active between 13,000 and 5,000 BC, i.e. at the height of the African wet period. "But what is particularly interesting is that our study shows that the rainfall was very intense, with rates of 55–80 mm per hour, and that such rainfall events were three to four times more frequent than before the African humid period, which is an enormous climate perturbation," says Abdallah Zaki.

Indeed, the annual rainfall rate alone does not reflect the intensity of the rains, and therefore the consequences. "If we take London as an example, we have the impression that it rains all the time," illustrates Sébastien Castelltort. "However, London sees an average of 680 mm of rain per year, compared to about 1400 mm in Geneva, which is more than twice as much!" It's simply that in London, rainfall is spread out over the whole year, whereas it is more concentrated in Geneva.

An explanation for the strong migration of the Nile populations

The results obtained by the geologists, i.e. this sudden increase in the frequency of intense rainfall events, provide an explanation for the strong migration of the region's riparian (living near the river) populations towards the center of the territory at that time, as observed by the archaeologists. "Indeed, the violent flooding of the rivers increased, making the banks inhospitable," confirms Abdallah Zaki.

This fourfold increase in violent rainfall also coincides with a 7°C increase in temperature in the region. "This study thus provides us with a historical lesson told by the rocks on how the Earth system behaves in the event of rapid global warming," says Sébastien Castelltort. Understanding the distribution of precipitation over the year will become a key issue in risk prevention today, because in a period of global warming, these risks will also increase in the near future. "What happened in Germany this summer will certainly become more common," he concludes.New study findings could help improve flood projections

More information: Abdallah S. Zaki et al, Did increased flooding during the African Humid Period force migration of modern humans from the Nile Valley?, Quaternary Science Reviews (2021). DOI: 10.1016/j.quascirev.2021.107200

Journal information: Quaternary Science Reviews 

Provided by University of Geneva 

 

Advancing agriculture threatens the livelihoods of forest-dependent people

by McGill University

Credit: CC0 Public Domain

Forest-dependent people living across the Gran Chaco have been put on the map for the first time. As agribusiness expands into the dry forest on which they rely, the impact of that expansion on them has been difficult to document because their homesteads are dotted over 1 million km2. But now an international team of researchers, including a researcher from McGill University, has used high resolution satellite imagery to systematically identify these homesteads across this vast area for the first time. By looking at images taken over a period of 30 years, the researchers found that where agribusiness advanced, the livelihoods of forest-dependent people were threatened, resulting in their displacement and the disappearance of thousands of homesteads. The researchers believe that mapping forest-dependent people is a much-needed step to better consider them in future sustainability planning.

There are few places on the globe where tropical forests are disappearing as rapidly as in the South American Gran Chaco. This semiarid lowland covers over a million km2 and stretches across parts of Paraguay, Bolivia, Argentina, and Brazil. While it's known that agricultural expansion into tropical forests leads to major environmental destruction, the social impacts of deforestation often remain hidden. A main reason for this is a lack of data on where people live inside tropical forests.

A new study, published today in the Proceedings of the National Academy of Sciences and involving an international team of researchers from Germany, Argentina, and the Netherlands, as well as from McGill University, puts these forest-dependent people on the map for the first time. By systematically using high-resolution satellite images, the team digitized individual homesteads of forest-dependent people across the Chaco and found that close to 20 percent of these homesteads had disappeared over the period between 1985-2015.

The effects of expanding agribusiness

"We found that in 1985 there were about 28,000 homesteads spread across almost half of the Chaco forests," says Dr. Christian Levers, Assistant Professor at VU Amsterdam and lead-author of the study. "By looking at images from the past 30 years we found that more than 5,000 homesteads have disappeared since then. And an even larger number of homesteads have lost the forests on which they depend due to encroaching agribusiness."

Forest-dependent people use the forests surrounding their homesteads for firewood and timber, livestock grazing, subsistence hunting, or collecting honey. But homestead numbers have been dropping as advancing agribusiness reduces the size of the forests on which they depend, and large-scale farmers erect fences that limit people's access to the forests that remain standing.

"Mapping where forest-dependent people live and how deforestation affects them is a first and much-needed step towards more adequately representing them in land-use planning and policy discussions," says Yann le Polain de Waroux, one of the study's co-authors and an Assistant Professor of Geography at McGill University.

Global consumption patterns

Deforestation in the Gran Chaco is related mainly to beef and soybean production for international markets, including those in Europe and North America. The study found that the homesteads that disappeared were mainly located where agribusiness has expanded most dramatically.

"This research clearly shows how our consumption impacts forest-dependent people around the world, people who are vulnerable and poor," says Dr. Alfredo Romero-Muñoz, a researcher at Humboldt University Berlin and co-author of the study. "Agriculture is expanding into many tropical dry forests around the world, and we urgently need to consider not only the impacts on biodiversity and the global climate, but also the huge impacts it has on forest-dependent people."

A key finding of the study is that deforestation leads to the increasing ecological marginalization of forest-dependent people. "What we mean here is that local people experience a massive erosion of the basis of their livelihoods as the forest is converted," explains Prof. Tobias Kuemmerle from Humboldt-University Berlin and a senior author on the study. "We also found that those homesteads that persist or have emerged are often in places that are not very suitable for agriculture, which is another form of marginalization."

The researchers believe that mapping forest-dependent people is a much-needed first step towards better considering them in future sustainability planning.

Mapping the 1.6 billion people who live near forests

More information: Christian Levers et al, Agricultural expansion and the ecological marginalization of forest-dependent people, Proceedings of the National Academy of Sciences (2021). DOI: 10.1073/pnas.2100436118

Journal information: Proceedings of the National Academy of Sciences 

Provided by McGill University