In response to a media enquiry regarding whether China agrees to become a signatory to the Southeast Asia Nuclear Weapon-Free Zone Treaty (SEANWFZ) along with Russia, and if so, why China has made this decision now, Chinese Foreign Ministry spokesperson Mao Ning said on Thursday that as ASEAN's comprehensive strategic partner and friendly neighbor, China has always firmly supported the establishment of a Southeast Asia Nuclear Weapon-Free Zone.
China and Russia have agreed to become signatories to the SEANWFZ, while the US is currently reviewing the treaty before signing, said Malaysian Foreign Minister Mohamad Hasan, as reported by Malaysian National News Agency Bernama.
Mohamad said the involvement of superpowers in the treaty would help preserve Southeast Asia as a region of peace, free of nuclear weapons, per Bernama.
"We have repeatedly made it clear that we are willing to be the first to sign the treaty. China is willing to continue communicating with ASEAN members regarding the signing of the protocol," Mao said.
In response to some Australian media outlets recently hyping China-related remarks made by Fiji's Prime Minister Sitiveni Rabuka while he was answering reporters' questions at the National Press Club of Australia, the Chinese Embassy in Fiji said in a statement on Thursday that the claims about "China setting up a military base in the Pacific" are false narratives. They are baseless and driven by ulterior motives.
Some media outlet, including Australian Broadcasting Corporation (ABC), has highlighted Fiji's Prime Minister Sitiveni Rabuka's remarks on "not welcome" any Chinese military bases in the region in the headline. While in the news, ABC also noted that Rabuka told the Press Club that he didn't believe China was actively looking for a military base in Pacific.
The Embassy noticed that Prime Minister Rabuka said he did not believe that China needs a base in the Pacific. The claims about "China setting up a military base in the Pacific" are false narratives. They are baseless and driven by ulterior motives, said the spokesperson.
China's presence in the Pacific is focused on building roads and bridges to improve people's livelihoods, not on stationing troops or setting up military bases. Never has China stirred up any dispute in the Pacific Region, violated any inch of land from Pacific Island Countries, or signed any agreement that forced Pacific Island Countries to sacrifice their sovereignty, according to the spokesperson.
China remains firmly committed to the international nuclear non-proliferation regime with the Treaty on the Non-Proliferation of Nuclear Weapons as the cornerstone and to the Pacific Nuclear Free Zone Treaty. We firmly support Pacific Island Countries in playing a bigger role in regional and international affairs, and will maintain communication with Pacific Island Countries on major international and regional hotspot issues to make positive contributions to the peace and stability of the Pacific region, said the Embassy spokesperson.
China and Fiji are comprehensive strategic partners, and security cooperation is part of our bilateral relations. China applauds Prime Minister Rabuka's vision for the Pacific as an "Ocean of Peace", and is committed to work with Fiji in contributing to peace and security in the region and beyond, said the Embassy spokesperson.
The spokesperson of the Embassy emphasizes that the Pacific Ocean is large enough to accommodate win-win cooperation among all countries. China sincerely calls on relevant parties to avoid viewing China-Fiji and China-Pacific Island Countries relations through the narrow lens of geopolitical games, hyping up the so-called threats of geopolitical competition in the region, forcing Pacific Island Countries to "take sides", and imposing their own interests on these countries. Instead, we urge them to do more concrete things that contribute to the development of Pacific Island Countries and the well-being of the people.
Over the past 20 years, the pace of equal and mutually beneficial bilateral cooperation between China and Pacific island countries has accelerated, which has caused unease and dissatisfaction among Western countries. They are attempting to use such propaganda tactic to drive a wedge between Pacific island nations and China — a common tactic of diplomatic blackmail they employ, Yu Lei, a professor from the Department of International Politics and Economics at Shandong University, told the Global Times.
China has always developed its relations with island countries based on the principles of peaceful coexistence and equality and mutual benefit, and has no intention of escalating military tensions in the region, said Yu.
In the statement, the spokesperson also said that the Embassy noticed Prime Minister Rabuka commented that China stood with Fiji when Australia turned away. He remarked that Fiji and China respect each other's sovereignty and we have not had any intrusion into our sovereign space.
China has no interest in geopolitical competition, or seeking the so-called "sphere of influence." There is no political strings attached to China's assistance, no imposing one's will onto others, and no empty promises. China advocates for all countries to uphold Pacific Island Countries' autonomy in making decisions, putting development first, and staying open and inclusive when developing relations with Pacific Island Countries, said the spokesperson.
China always believes that the Pacific is the homeland of the people of Pacific Island Countries, not the backyard of big powers outside the region. The Pacific is a stage for cooperation, not a battlefield for vicious competition. It makes no sense to view China's sincere help to Pacific Island Countries from the narrow perspective of geo-competition, said the spokesperson.
Forcing Pacific Island Countries to "choose sides" can never address the urgent demands for development of the people from the Pacific Island Countries, nor the common threat of climate change to mankind, said the spokesperson.
At nearly 30 hours and 20,000 kilometers away from Beijing, Buenos Aires in Argentina is one of the furthest destinations in the world from the Chinese capital. In a popular 2024 stand-up comedy show, Yan Hexiang, a Chinese actor and crosstalk performer, humorously pointed out that the antipodal point to Beijing is located in the Pampas grasslands of Argentina. However, the distance between Argentina and China doesn't seem so far. Just about 38 kilometers from Ministro Pistarini International Airport in Buenos Aires, is a largely commercial section about five blocks long in the district of Belgrano, where a towering Chinese-style archway greets you, inscribed with the words "China Town."
The Global Times has visited many "Chinatowns" around the world, including those in Washington, London, and Nagasaki. However, Buenos Aires' "Chinatown" is quite different from the rest. This is immediately apparent upon entry: On a Sunday evening, the streets bustle with activity, restaurants have long wait times, and shops attend to numerous customers. Upon closer inspection, the Global Times noticed that non-Chinese diners and shoppers actually outnumber Chinese ones.
In Chinese, the word "foreigner" is used to refer to anyone who is not Chinese, therefore within the context of Buenos Aires, it is used to refer to non-Chinese locals. In many other "Chinatowns" in the world, Chinese nationals are surrounded by their own, and while the occasional less-than-authentic Chinese cuisine might remind them that "this is not China," the presence of Chinese nationals gives a sense of belonging. In contrast, in Buenos Aires' "Chinatown," surrounded by countless local faces, the "Chinese nationals" seem more like visitors passing through.
Famous Chinese hotpot restaurant brands like Little Sheep Mongolian Hot Pot, Shoo Loong Kan Hot Pot, and Haidilao Hot Pot, commonly found in American "Chinatowns," are conspicuously absent. However, Chinese culture, cuisine, and products are everywhere, and even bubble tea has become a favorite among the youth in the "Chinatown." A capybara in a shop window observes the comings and goings, much like its counterpart in the trendy toy area of Chaoyang district's Joy City mall in Beijing, 20,000 kilometers away. In addition to Chinese elements, graffiti in the style of Japanese animator, filmmaker, and manga artist Hayao Miyazaki features the Chinese characters for "Visited Here," and posters of South Korean idols appear in shop windows, indicating that this "Chinatown" not only spreads Chinese culture but also incorporates East Asian elements. A few steps further, a street magician interacts with the audience, with a prominent image of "Guanyin" on the wall behind him, as if everything before us is being witnessed by the bodhisattva. Why are there so many "foreigners" in Buenos Aires' "Chinatown"? Locals provided various answers. Most people's first response was that "Chinatown" is an important social media hotspot in Buenos Aires. If you plan a day trip to the city, this is a must-visit location. "You visited on the last day of a long weekend, so of course, there were many people shopping and dining; people love going to Chinatown," a local Chinese national told the Global Times.
Another local explained that unlike many other "Chinatowns," Buenos Aires' "Chinatown" has a significant number of Chinese residents, but it is not the main gathering place for the local Chinese community. With its trendy atmosphere, it naturally attracts a lot of young people, making the "foreigners" seem particularly popular.
What is it that attracts so many "foreigners" to this "Chinatown"? "Chinese cuisine" topped the list of mentions, with Chinese products and culture also frequently cited among those interviewed by the Global Times. "Yufu" is a relatively authentic Cantonese restaurant in Buenos Aires' "Chinatown," where Chinese food is on the pricier side compared to local dining options. Yet even at 2:10 pm on Sunday, the restaurant was still packed, and the number of Chinese diners was visibly less than half of all patrons.
"Exquisite, compact, and easy to explore," said Nora, director of a research company in Buenos Aires, when asked about the "Chinatown". She added, "I love the dim sum in 'Chinatown'; I enjoy the exotic atmosphere there. The shop owners are very friendly, and the products are diverse; you can find many things you want in one store."
Liu Jialong, a 19-year-old local of Chinese descent, told the Global Times that "Buenos Aires also has a 'Koreantown,' which is only one street and much smaller than 'Chinatown.' It used to be very popular, but its popularity has declined. In contrast, 'Chinatown' is booming now."
If China were not becoming stronger and developing so rapidly, would people be increasingly interested in China? he asked.
On the diplomatic front, the Milei administration made some comments about China that were deemed newsworthy by some Western media outlets before taking office. However, Argentines, including scholars and businesspeople, that the Global Times reporter met here during the trip place great importance on China-Argentina relations. China is Latin America's second-largest trading partner and holds the top position in several countries. In a recent survey released by the Global Times Institute (GTI), in collaboration with the Latin American Council of Social Sciences (CLACSO) and the China-Latin America Education and Culture Center, on the "China-LAC mutual perception" conducted in both regions found that the most prominent impression left by China on Latin Americans was "technology." When asked to fill in keywords that represent their primary impressions of China, a Gen Z respondent from Argentina mentioned "DeepSeek." Of all those interviewed by the Global Times, Wu Ditai, a young Argentine scholar who studied at Peking University, was the most knowledgeable about China. Watching him mimic the distinct drawl common among Beijing's taxi drivers was as impressive as it was comedic.
"It's not just 'Chinatown'; if you look deeper, Argentines are very curious about China. They want to know why China is developing so quickly and what experiences Argentina can learn from," Wu Ditai said. He has plans to return to China soon and hopes to travel across all provinces to gain a deeper understanding of the country.
Of course, the reality is that many Argentines do not have a sufficient understanding of China. Most of their information comes from the media, especially Western media sources and social media.
An Argentine journalist told the Global Times that while there is considerable coverage of China in local media, the current lack of understanding among Argentines about China is unlikely to change in the short term.
"'China Travel' is a trending topic now, and Argentina has visa-free access. The real China is right there, and everyone is welcomed to learn about it," the Global Times told Wu Ditai.
The world already has the know-how and tools to dramatically reduce emissions from fossil fuels — but we need to use those tools immediately if we hope to forestall the worst impacts of climate change. That’s the message of the third and final installment of the massive sixth assessment of climate science by the United Nations’ Intergovernmental Panel on Climate Change, which was released April 4.
“We know what to do, we know how to do it, and now it’s up to us to take action,” said sustainable energy researcher Jim Skea of Imperial College London, who cochaired the report, at a news event announcing its release. Earth is on track to warm by an average of about 3.2 degrees Celsius above preindustrial levels by the end of the century (SN: 11/26/19). Altering that course and limiting warming to 1.5 degrees or even 2 degrees means that global fossil fuel emissions will need to peak no later than the year 2025, the new report states.
Right now, meeting that goal looks extremely unlikely. National pledges to reduce fossil fuel emissions to date amount to “a litany of broken climate promises,” said United Nations Secretary-General António Guterres at the event.
The previous two installments of the IPCC’s sixth assessment described how climate change is already fueling extreme weather events around the globe — and noted that adaptation alone will not be enough to shield people from those hazards (SN: 8/9/21; SN: 2/28/22).
The looming climate crisis “is horrifying, and I don’t want to sugarcoat that,” says Bronson Griscom, a forest ecologist and the director of Natural Climate Solutions at the environmental organization Conservation International, based in Arlington, Va.
But Griscom, who was not an author on the new IPCC report, says its findings also give him hope. It’s “what I would call a double-or-nothing bet that we’re confronted with right now,” he says. “There [are] multiple ways that this report is basically saying, ‘Look, if we don’t do anything, it’s increasingly grim.’ But the reasons to do something are incredibly powerful and the tools in the toolbox are very powerful.”
Tools in the toolbox Those tools are strategies that governments, industries and individuals can use to cut emissions immediately in multiple sectors of the global economy, including transportation, energy, building, agriculture and forestry, and urban development. Taking immediate advantage of opportunities to reduce emissions in each of those sectors would halve global emissions by 2030, the report states.
Consider the transportation sector, which contributed 15 percent of human-related greenhouse gas emissions in 2019. Globally, electric vehicle sales have surged in the last few years, driven largely by government policies and tougher emissions laws for the auto industry (SN: 12/22/21).
If that surge continues, “electric vehicles offer us the greatest potential [to reduce transportation emissions on land], as long as they’re combined with low or zero carbon electricity sources,” Diana Ürge-Vorsatz, the vice chair of the IPCC’s Working Group III, said at the news event. But for aviation and long-haul shipping, which are more difficult to electrify, reduced carbon emissions could be achieved with low-carbon hydrogen fuels or biofuels, though these alternatives require further research and development.
Then there are urban areas, which are contributing a growing proportion of global greenhouse gas emissions, from 62 percent in 2015 to between 67 and 72 percent in 2020, the report notes. In established cities, buildings can be retrofitted, renovated or repurposed to make city layouts more walkable and provide more accessible public transportation options.
And growing cities can incorporate energy-efficient infrastructure and construct buildings using zero-emissions materials. Additionally, urban planners can take advantage of green roofs, urban forests, rivers and lakes to help capture and store carbon, as well as provide other climate benefits such as cleaner air and local cooling to counter urban heat waves (SN: 4/3/18).
Meanwhile, “reducing emissions in industry will involve using materials and energy more efficiently, reusing and recycling products and minimizing waste,” Ürge-Vorsatz said.
As for agriculture and forestry, these and other land-use industries contribute about 22 percent of the world’s greenhouse gas emissions, with half of those emissions coming from deforestation (SN: 7/13/21). So reforestation and reduced deforestation are key to flipping the balance between CO₂ emissions and removal from the atmosphere (SN: 7/9/21; SN: 1/3/22). But there are a lot of other strategies that the world can employ at the same time, the report emphasizes. Better management of forests, coastal wetlands, grasslands and other ecosystems, more sustainable crop and livestock management, soil carbon management in agriculture and agroforestry can all bring down emissions (SN: 7/14/21).
The report also includes, for the first time in the IPCC’s reports, a chapter on the “untapped potential” of lifestyle changes to reduce emissions. Such changes include opting for walking or cycling or using public transportation rather than driving, shifting toward plant-based diets and reducing air travel (SN: 5/14/20).
Those lifestyle changes could reduce emissions by 40 to 70 percent by 2050, the report suggests. To enable those changes, however, government policies, infrastructure and technology would need to be in place.
Government policies are also key to financing these transformational changes. Globally, the investment in climate-related technologies needs to ramp up, and quickly, to limit warming below 2 degrees C, the report states. Right now, investments are three to six times lower than they need to be by 2030. And a combination of public and private investments will be essential to aiding the transition away from fossil fuels and toward renewable energy in developing nations (SN: 1/25/21).
Future strategies Still, reducing emissions alone won’t be enough: We will need to actively remove carbon from the atmosphere to achieve net zero emissions and keep the planet well below 2 degrees C of warming, the report notes. “One thing that’s clear in this report, as opposed to previous reports, is that carbon removal is going to be necessary in the near term,” says Simon Nicholson, director of the Institute for Carbon Removal Law and Policy at American University in Washington, D.C., who was not involved in the report.
Such strategies include existing approaches such as protecting or restoring carbon dioxide–absorbing forests, but also technologies that are not yet widely available commercially, such as directly capturing carbon dioxide from the air, or converting the gas to a mineral form and storing it underground (SN: 12/17/18).
These options are still in their infancy, and we don’t know how much of an impact they’ll have yet, Nicholson says. “We need massive investment now in research.”
An emphasis on acting “now,” on eliminating further delay, on the urgency of the moment has been a recurring theme through all three sections of the IPCC’s sixth assessment report released over the last year. What impact these scientists’ stark statements will have is unclear.
But “the jury has reached a verdict, and it is damning,” U.N. Secretary-General Guterres said. “If you care about justice and our children’s future, I am appealing directly to you.”
A chance alignment may have revealed a star from the universe’s first billion years.
If confirmed, this star would be the most distant one ever seen, obliterating the previous record (SN: 7/11/17). Light from the star traveled for about 12.9 billion years on its journey toward Earth, about 4 billion years longer than the former record holder, researchers report in the March 30 Nature. Studying the object could help researchers learn more about the universe’s composition during that early, mysterious time.
“These are the sorts of things that you only hope you could discover,” says astronomer Katherine Whitaker of the University of Massachusetts Amherst, who was not part of the new study. The researchers found the object while analyzing Hubble Space Telescope images of dozens of clusters of galaxies nearer to Earth. These clusters are so massive that they bend and focus the light from more distant background objects, what’s known as gravitational lensing (SN: 10/6/15).
In images of one cluster, astronomer Brian Welch of Johns Hopkins University and colleagues noticed a long, thin, red arc. The team realized that the arc was a background galaxy whose light the cluster had warped and amplified.
Atop that red arc is a bright spot that is too small to be a small galaxy or a star cluster, the researchers say. “We stumbled into finding that this was a lensed star,” Welch says.
The researchers estimate that the star’s light originates from only 900 million years after the Big Bang, which took place about 13.8 billion years ago.
Welch and his colleagues think that the object, which they poetically nicknamed “Earendel” from the old English word meaning “morning star” or “rising light,” is a behemoth with at least 50 times the mass of the sun. But the researchers can’t pin down that value, or learn more about the star or even confirm that it is a star, without more detailed observations.
The researchers plan to use the recently launched James Webb Space Telescope to examine Earendel (SN: 10/6/21). The telescope, also known as JWST, will begin studying the distant universe this summer.
JWST may uncover objects from even earlier times in the universe’s history than what Hubble can see because the new telescope will be sensitive to light from more distant objects. Welch hopes that the telescope will find many more of these gravitationally lensed stars. “I’m hoping that this record won’t last very long.”
Leeches suck. Most people try to avoid them. But in the summer of 2016, park rangers in China’s Ailaoshan Nature Reserve went hunting for the little blood gluttons.
For months, the rangers searched through the reserve’s evergreen forest, gathering tens of thousands of leeches by hand and sometimes plucking the slimy parasites from the rangers’ own skin. Each time the rangers found a leech, they would place it into a little, preservative-filled tube, tuck the tube into a hip pack and carry on. The work could help aid conservation efforts, at Ailaoshan and elsewhere.
There are many ways to measure how much effort goes into wildlife conservation, but it’s difficult to assess the success of that effort, even in protected areas, says Douglas Yu, an ecologist at the Kunming Institute of Zoology in China. But bloodthirsty worms may be just the tool for the job. Leeches aren’t picky eaters — they’ll feast on the blood of many different creatures, from amphibians to mammals to fish. Scientists have shown they can extract animal DNA from blood that leeches and other bloodsucking creatures have ingested, what’s known as invertebrate-derived DNA, or iDNA, and identify the source animal.
And some researchers had suggested that iDNA, a type of environmental DNA, could be used to trace the ranges of animals in an area, Yu says (SN: 1/18/22). “We thought we would just actually just try to do it.”
Enlisting 163 park rangers, Yu and colleagues deputized the leech-hunters with gathering the parasites along rangers’ regular patrol routes, which covered all 172 areas of the reserve.
Three months later, the rangers had gathered 30,468 leeches. After extracting and analyzing animal DNA from the leeches’ blood meals, Yu and colleagues detected the presence of 86 different species, including Asiatic black bears, domestic cattle, endangered Yunnan spiny frogs and, of course, humans.
What’s more, the iDNA gave clues to where the animals preferred to roam, the researchers report March 23 in Nature Communications. Wildlife biodiversity was greatest in the reserve’s high-altitude interior, the researchers found, while domestic cattle, sheep and goats were more abundant in the reserve’s lower, more accessible zones. Because most of the wild species detected should be able to inhabit all parts of the reserve, the dichotomy suggests that human activity may be pushing wildlife away from certain areas, Yu says.
Compared with other methods for surveying wildlife, using iDNA from leeches is “really cost- and time-efficient and doesn’t require a lot of expertise,” says Arthur Kocher, an ecologist at the Max Planck Institute for the Science of Human History in Jena, Germany, who was not involved in the study.
Camera traps, for instance, are triggered only by animals of large enough size, and the instruments are expensive. Sight-based surveys require trained observers. With leeches, Kocher says, “there are clear advantages.”
Yu and Kocher both suspect that leeches and other bloodsucking critters, such as carrion flies or mosquitoes, will become more popular wildlife surveillance tools in the future. People are becoming more aware of what iDNA brings to the table, Yu says.
Western banded geckos don’t look like they’d win in a fight. Yet this unassuming predator dines on venomous scorpions, and a field study published in the March Biological Journal of the Linnean Society shows how the lizards take down such perilous prey.
Geckos bite the scorpion and thrash their heads and upper bodies back and forth, body-slamming the scorpion against the ground, new high-speed video reveals. “The behavior is so fast that you can’t see what’s actually happening,” says San Diego State University biologist Rulon Clark. “[You] see the gecko lunge and then see this crazy blur of motion … like trying to watch the wings of a hummingbird.”
Clark first noticed the behavior in the 1990s, during undergraduate fieldwork in the Sonoran Desert near Yuma, Ariz. When he returned with colleagues to study kangaroo rats and rattlesnakes, the team filmed geckos as well. The researchers captured western banded geckos (Coleonyx variegatus) and dune scorpions (Smeringurus mesaensis) in the desert at night (along with harmless arthropods, like field crickets and sand roaches, to compare), and documented the showdowns. Normal gecko feeding behavior usually involves lunging out, grabbing prey with their mouth, and chomping it, says Clark. With scorpions, it’s totally different after the initial lunge. Such shake feeding is a known method for carnivores and adventurous eaters. For instance, dolphins shake (and toss) octopuses before eating (SN: 4/25/17).
The fact that this delicate, cold-blooded species not known for speed can achieve such physical gyrations is impressive, Clark says. Songbirds called loggerhead shrikes whip larger predators in circles (SN: 9/7/18), but at a lower frequency (11 hertz compared to 14 Hz in geckos). Whiptail lizards also violently shake scorpions, but at unknown speeds. The closest documented match to the speed of gecko shake feeding is small mammals shaking themselves dry; guinea pigs clock in at around 14 Hz, as well.
It’s unclear how common this behavior is among geckos. And aside from generally subduing a venomous foe, how it works — killing the scorpion, immobilizing it, damaging its stinger, or reducing how much venom gets injected — remains a mystery.
In one of the tallest trees on Earth, a tan, mottled salamander ventures out on a fern growing high up on the trunk. Reaching the edge, the amphibian leaps, like a skydiver exiting a plane.
The salamander’s confidence, it seems, is well-earned. The bold amphibians can expertly control their descent, gliding while maintaining a skydiver’s spread-out posture, researchers report May 23 in Current Biology.
Wandering salamanders (Aneides vagrans) are native to a strip of forest in far northwestern California. They routinely climb into the canopies of coast redwoods (Sequoia sempervirens). There — as high as 88 meters up — the amphibians inhabit mats of ferns that grow in a suspended, miniature ecosystem. Unlike many salamanders that typically spend their days in streams or bogs, some of these wanderers may spend their whole lives in the trees. Integrative biologist Christian Brown was studying these canopy crawlers as a graduate student at California State Polytechnic University, Humboldt in Arcata, when he noticed they would jump from a hand or branch when perturbed.
Now at the University of South Florida in Tampa, Brown and his colleagues wondered if the salamanders’ arboreal ways and proclivity to leap were related, and if the small creatures could orient themselves during a fall.
Brown and his team captured five each of A. vagrans, a slightly less arboreal species (A. lugubris), and two ground-dwelling salamanders (A. flavipunctatus and Ensatina eschscholtzii). The researchers then put each salamander in a vertical wind tunnel to simulate falling from a tree, filming the animals’ movements with a high-speed camera.
In all of 45 trials, the wandering salamanders showed tight control, using their outstretched limbs and tail to maintain a stable position in the air and continually adjusting as they sailed. All these salamanders slowed their descents’ speed, what the researchers call parachuting, using their appendages at some point, and many would change course and move horizontally, or glide.
“We expected that maybe [the salamanders] could keep themselves upright. However, we never expected to observe parachuting or gliding,” Brown says. “They were able to slow themselves down and change directions.” A. lugubris had similar aerial dexterity to A. vagrans but glided less (36 percent of the trials versus 58 percent). The two ground huggers mostly flailed ineffectively in the wind.
The wandering salamanders’ maneuverable gliding is probably invaluable in the tops of the tall redwoods, Brown says. Rerouting midair to a fern mat or branch during an accidental fall would save the effort spent crawling back up a tree. Gliding might also make jumping to escape a hungry owl or carnivorous mammal a feasible option.
Brown suspects that the salamanders may also use gliding to access better patches to live. “Maybe your fern mat’s drying out, maybe there’s no bugs. Maybe there are no mates in your fern mat, you look down — there’s another fern mat,” Brown says. “Why would you take the time to walk down the tree and waste energy, be exposed and [risk] being preyed upon, when you could take the gravity elevator?”
There are other arboreal salamanders in the tropics, but those don’t live nearly as high as A. vagrans, says Erica Baken, a macroevolutionary biologist at Chatham University in Pittsburgh who was not involved with the research.
“It would be interesting to find out if there is a height at which [gliding] evolves,” she says.
A. vagrans’ relatively flat body, long legs and big feet may allow more control in the air. Brown and his colleagues are now using computer simulations to test how body proportions could impact gliding.
Such body tweaks, if they do turn out to be meaningful, wouldn’t be as conspicuous as the sprawling, membraned forms seen in other animals like flying snakes and colugos that are known for their gliding (SN: 6/29/20; SN: 11/20/20). There may be many tree-dwelling animals with conventional body plans that have been overlooked as gliders, Brown says. “The canopy world is just starting to unfold.”
Four billion years ago, lava spilled onto the moon’s crust, etching the man in the moon we see today. But the volcanoes may have also left a much colder legacy: ice.
Two billion years of volcanic eruptions on the moon may have led to the creation of many short-lived atmospheres, which contained water vapor, a new study suggests. That vapor could have been transported through the atmosphere before settling as ice at the poles, researchers report in the May Planetary Science Journal. Since the existence of lunar ice was confirmed in 2009, scientists have debated the possible origins of water on the moon, which include asteroids, comets or electrically charged atoms carried by the solar wind (SN: 11/13/09). Or, possibly, the water originated on the moon itself, as vapor belched by the rash of volcanic eruptions from 4 billion to 2 billion years ago.
“It’s a really interesting question how those volatiles [such as water] got there,” says Andrew Wilcoski, a planetary scientist at the University of Colorado Boulder. “We still don’t really have a good handle on how much are there and where exactly they are.”
Wilcoski and his colleagues decided to start by tackling volcanism’s viability as a lunar ice source. During the heyday of lunar volcanism, eruptions happened about once every 22,000 years. Assuming that H2O constituted about a third of volcano-spit gasses — based on samples of ancient lunar magma — the researchers calculate that the eruptions released upward of 20 quadrillion kilograms of water vapor in total, or the volume of approximately 25 Lake Superiors.
Some of this vapor would have been lost to space, as sunlight broke down water molecules or the solar wind blew the molecules off the moon. But at the frigid poles, some could have stuck to the surface as ice.
For that to happen, though, the rate at which the water vapor condensed into ice would have needed to surpass the rate at which the vapor escaped the moon. The team used a computer simulation to calculate and compare these rates. The simulation accounted for factors such as surface temperature, gas pressure and the loss of some vapor to mere frost.
About 40 percent of the total erupted water vapor could have accumulated as ice, with most of that ice at the poles, the team found. Over billions of years, some of that ice would have converted back to vapor and escaped to space. The team’s simulation predicts the amount and distribution of ice that remains. And it’s no small amount: Deposits could reach hundreds of meters at their thickest point, with the south pole being about twice as icy as the north pole.
The results align with a long-standing assumption that ice dominates at the poles because it gets stuck in cold traps that are so cold that ice will stay frozen for billions of years. “There are some places at the lunar poles that are as cold as Pluto,” says planetary scientist Margaret Landis of the University of Colorado Boulder.
Volcanically sourced water vapor traveling to the poles, though, probably depends on the presence of an atmosphere, say Landis, Wilcoski and their colleague Paul Hayne, also a planetary scientist at the University of Colorado Boulder. An atmospheric transit system would have allowed water molecules to travel around the moon while also making it more difficult for them to flee into space. Each eruption triggered a new atmosphere, the new calculations indicate, which then lingered for about 2,500 years before disappearing until the next eruption some 20,000 years later.
This part of the story is most captivating to Parvathy Prem, a planetary scientist at Johns Hopkins Applied Physics Laboratory in Laurel, Md., who wasn’t involved in the research. “It’s a really interesting act of imagination.… How do you create atmospheres from scratch? And why do they sometimes go away?” she says. “The polar ices are one way to find out.”
If lunar ice was belched out of volcanoes as water vapor, the ice may retain a memory of that long-ago time. Sulfur in the polar ice, for example, would indicate that it came from a volcano as opposed to, say, an asteroid. Future moon missions plan to drill for ice cores that could confirm the ice’s origin.
Looking for sulfur will be important when thinking about lunar resources. These water reserves could someday be harvested by astronauts for water or rocket fuel, the researchers say. But if all the lunar water is contaminated with sulfur, Landis says, “that’s a pretty critical thing to know if you plan on bringing a straw with you to the moon.”
In the unceasing battle against dust, humans possess a deep arsenal of weaponry, from microfiber cloths to feather dusters to vacuum cleaners. But new research suggests that none of that technology can compare to nature’s secret weapon — biological soil crusts.
These biocrusts are thin, cohesive layers of soil, glued together by dirt-dwelling organisms, that often carpet arid landscapes. Though innocuous, researchers now estimate that these rough soil skins prevent around 700 teragrams (30,000 times the mass of the Statue of Liberty) of dust from wafting into the air each year, reducing global dust emissions by a staggering 60 percent. Unless steps are taken to preserve and restore biocrusts, which are threatened by climate change and shifts in land use, the future will be much dustier, ecologist Bettina Weber and colleagues report online May 16 in Nature Geoscience. Dry-land ecosystems, such as savannas, shrublands and deserts, may appear barren, but they’re providing this important natural service that is often overlooked, says Weber, of the Max Planck Institute for Chemistry in Mainz, Germany. These findings “really call for biocrust conservation.”
Biocrusts cover around 12 percent of the planet’s land surface and are most often found in arid regions. They are constructed by communities of fungi, lichens, cyanobacteria and other microorganisms that live in the topmost millimeters of soil and produce adhesive substances that clump soil particles together. In dry-land ecosystems, biocrusts play an important role in concentrating nutrients such as carbon and nitrogen and also help prevent soil erosion (SN: 4/12/22).
And since most of the world’s dust comes from dry lands, biocrusts are important for keeping dust bound to the ground. Fallen dust can carry nutrients that benefit plants, but it can also reduce water and air quality, hasten glacier melting and reduce river flows. For instance in the Upper Colorado River Basin, researchers found that dust not only decreased snow’s ability to reflect sunlight, but it also shortened the duration of snow cover by weeks, reducing flows of meltwater into the Colorado River by 5 percent. That’s more water than the city of Las Vegas draws in a year, says Matthew Bowker, an ecologist from Northern Arizona University in Flagstaff who wasn’t involved in the new study.
Experiments had already demonstrated that biocrusts strengthened soils against erosion, but Weber and her colleagues were curious how that effect played out on a global scale. So they pulled data from experimental studies that measured wind velocities needed to erode dust from various soil types and calculated how differences in biocrust coverage affected dust generation. They found that the wind velocities needed to erode dust from soils completely shielded by biocrusts were on average 4.8 times greater than the wind velocities need to erode bare soils.
The researchers then incorporated their results, along with data on global biocrust coverage, into a global climate simulation which allowed them to estimate how much dust the world’s biocrusts trapped each year.
“Nobody has really tried to make that calculation globally before,” says Bowker. “Even if their number is off, it shows us that the real number is probably significant.”
Using projections of future climate conditions and data on the conditions biocrusts can tolerate, Weber and her colleagues estimated that by 2070, climate change and land-use shifts may result in biocrust losses of 25 to 40 percent, which would increase global dust emissions by 5 to 15 percent.
Preserving and restoring biocrusts will be key to mitigating soil erosion and dust production in the future, Bowker says. Hopefully, these results will help to whip up more discussions on the impacts of land-use changes on biocrust health, he says. “We need to have those conversations.”
