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Firefighting planes are dumping ocean water on the Los Angeles fires − why using saltwater is typically a last resort
Firefighters in Los Angeles use seawater to combat wildfires due to freshwater shortages, though this poses risks to ecosystems and equipment.

Patrick Megonigal, Smithsonian Institution
Firefighters battling the deadly wildfires that raced through the Los Angeles area in January 2025 have been hampered by a limited supply of freshwater. So, when the winds are calm enough, skilled pilots flying planes aptly named Super Scoopers are skimming off 1,500 gallons of seawater at a time and dumping it with high precision on the fires.
Using seawater to fight fires can sound like a simple solution – the Pacific Ocean has a seemingly endless supply of water. In emergencies like Southern California is facing, it’s often the only quick solution, though the operation can be risky amid ocean swells.
But seawater also has downsides.
Saltwater corrodes firefighting equipment and may harm ecosystems, especially those like the chaparral shrublands around Los Angeles that aren’t normally exposed to seawater. Gardeners know that small amounts of salt – added, say, as fertilizer – does not harm plants, but excessive salts can stress and kill plants.
While the consequences of adding seawater to ecosystems are not yet well understood, we can gain insights on what to expect by considering the effects of sea-level rise.
A seawater experiment in a coastal forest
As an ecosystem ecologist at the Smithsonian Environmental Research Center, I lead a novel experiment called TEMPEST that was designed to understand how and why historically salt-free coastal forests react to their first exposures to salty water.
Sea-level rise has increased by an average of about 8 inches globally over the past century, and that water has pushed salty water into U.S. forests, farms and neighborhoods that had previously known only freshwater. As the rate of sea-level rise accelerates, storms push seawater ever farther onto the dry land, eventually killing trees and creating ghost forests, a result of climate change that is widespread in the U.S. and globally.
In our TEMPEST test plots, we pump salty water from the nearby Chesapeake Bay into tanks, then sprinkle it on the forest soil surface fast enough to saturate the soil for about 10 hours at a time. This simulates a surge of salty water during a big storm.
Our coastal forest showed little effect from the first 10-hour exposure to salty water in June 2022 and grew normally for the rest of the year. We increased the exposure to 20 hours in June 2023, and the forest still appeared mostly unfazed, although the tulip poplar trees were drawing water from the soil more slowly, which may be an early warning signal.
Things changed after a 30-hour exposure in June 2024. The leaves of tulip poplar in the forests started to brown in mid-August, several weeks earlier than normal. By mid-September the forest canopy was bare, as if winter had set in. These changes did not occur in a nearby plot that we treated the same way, but with freshwater rather than seawater.
The initial resilience of our forest can be explained in part by the relatively low amount of salt in the water in this estuary, where water from freshwater rivers and a salty ocean mix. Rain that fell after the experiments in 2022 and 2023 washed salts out of the soil.
But a major drought followed the 2024 experiment, so salts lingered in the soil then. The trees’ longer exposure to salty soils after our 2024 experiment may have exceeded their ability to tolerate these conditions.
Seawater being dumped on the Southern California fires is full-strength, salty ocean water. And conditions there have been very dry, particularly compared with our East Coast forest plot.
Changes evident in the ground
Our research group is still trying to understand all the factors that limit the forest’s tolerance to salty water, and how our results apply to other ecosystems such as those in the Los Angeles area.
Tree leaves turning from green to brown well before fall was a surprise, but there were other surprises hidden in the soil below our feet.
Rainwater percolating through the soil is normally clear, but about a month after the first and only 10-hour exposure to salty water in 2022, the soil water turned brown and stayed that way for two years. The brown color comes from carbon-based compounds leached from dead plant material. It’s a process similar to making tea.
Our lab experiments suggest that salt was causing clay and other particles to disperse and move about in the soil. Such changes in soil chemistry and structure can persist for many years.
Sea-level rise is increasing coastal exposure
While ocean water can help fight fires, there are reasons fire officials prefer freshwater sources – provided freshwater is available.
U.S. coastlines, meanwhile, are facing more extensive and frequent saltwater exposure as rising global temperatures accelerate sea-level rise that drowns forests, fields and farms, with unknown risks for coastal landscapes.
Patrick Megonigal, Associate Director of Research, Smithsonian Environmental Research Center, Smithsonian Institution
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Are animals smart? From dolphin language to toolmaking crows, lots of species have obvious intelligence

Leticia Fanucchi, Oklahoma State University
Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to [email protected].
Are animals smart? – Deron
It’s a fascinating question that intrigues millions of pet owners, animal lovers, veterinarians and scientists all over the world: Just how smart are animals?
Scientists once believed a brain with billions of neurons was a requirement for intelligence. After all, that’s why you’re able to think – neurons are the nerve cells in the brain that connect and transmit messages to each other.
For the record, the human brain has about 86 billion neurons. For comparison, dogs and cats have less than one billion.
Yet the more that scientists like me study animal emotion and cognition – the ability to learn through experiences and thinking – the more we find that humans are not very special at all. Many nonhuman species can do these things too.
Right now, there’s no agreement on how to decide whether a particular animal species is intelligent. But most scientists who study animal cognition have observed that many animals are able to solve problems, use tools, recall important information about their environment and recognize themselves in the mirror.
Toolmaking bears and crows
Memory is a marker of intelligence. Of all animals, humans possess the most accurate and sophisticated memory. But elephants can recognize as many as 30 traveling companions at a time. They also learn to migrate away from drought-prone areas, based on memories of earlier droughts.
That kind of recall – known as episodic memory – is the ability to remember an event, including when and where it occurred. Until recently, scientists thought only humans had it. But now researchers have learned that some birds, cats, rats, monkeys and dolphins have it too.
Animals may not remember every experience – neither do people – but they do recall things critical to their survival. For example, birds know where they stored food. Monkeys know the presence of a predator.
Scientists once thought tool use was an exclusively human ability, but that’s not so. Chimpanzees use sticks to catch termites and stones to crack nuts open. Crows can even manufacture tools. By bending a wire, they can make a hook to retrieve a food reward that’s otherwise out of reach.
Researchers presented eight captive brown bears with this food challenge: Three objects – a large log, a small log and a box – were placed in an outdoor enclosure. A food reward was suspended above them. Six of the eight bears were able to move the logs and box into positions that enabled them to fetch the reward. Essentially, they used the three objects as tools.
Dolphin, chimpanzee communication
Language is another measure of intelligence. People, of course, have enormously sophisticated communication skills. But dolphins have complex dialects in the form of crackles, squeaks and whistles. Many researchers say the noises are a language. Chimpanzees and gorillas have used sign language to express emotions and ask for things from people.
Self-awareness – the ability to recognize yourself as an individual – signals intelligence. Babies don’t recognize themselves in the mirror until they are about a year and a half old. Up until then, they probably think the mirror image they see is another baby.
Many other species, including dolphins, ravens and elephants, recognize themselves in the mirror. Researchers put a red dye mark on chimpanzees under anesthesia; once awake, the chimps saw their reflection in a mirror. Instead of touching the red mark on their reflection in the glass, they touched the red mark on themselves, indicating self-recognition.
Just because animals can’t do certain things, it doesn’t mean they’re unintelligent. After all, humans can’t fly like a bird or swim like a fish. Nor is there a need for us to have the incredible sense of smell a dog has. We’d be sniffing hundreds of different smells from miles away – the scents from perfumes and pollution, gardens and garbage. From an evolutionary standpoint, that wouldn’t help us much. Plus, we’d get sick of it very quickly.
But all animals, including humans, have developed a wide range of capabilities so they can succeed in the environment they live in. Put simply, we’re all using our brains. Now that’s intelligent.
Hello, curious kids! Do you have a question you’d like an expert to answer? Ask an adult to send your question to [email protected]. Please tell us your name, age and the city where you live.
And since curiosity has no age limit – adults, let us know what you’re wondering, too. We won’t be able to answer every question, but we will do our best.
Leticia Fanucchi, Clinical Assistant Professor of Veterinary Clinical Sciences, Oklahoma State University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/
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A boycott campaign fuels tension between Black shoppers and Black-owned brands – evoking the long struggle for ‘consumer citizenship’
Target’s recent decision to end its diversity programs has sparked backlash among Black consumers and entrepreneurs. While some call for a boycott, others caution that it could harm Black businesses more than the retailer.

Timeka N. Tounsel, University of Washington
Some Black consumers may be breaking up with Target this February.
It all started late last month, when the retailer announced that it was ending its diversity, equity and inclusion programs. The move drew widespread rebuke from social justice organizers, including New Birth Missionary Baptist Church Pastor Dr. Jamal Bryant. Although Target said one set of its racial-equity initiatives had already been scheduled to conclude, the timing was notable: The move came just days after the White House called for a federal DEI ban, and as several other companies took similar actions.
Beyond renaming its “supplier diversity” team – now called “supplier engagement” – and ending “diversity-focused surveys,” Target hasn’t said what the change will mean for the many Black entrepreneurs who sell everything from coffee to sunscreen on its shelves. The webpage for the retailer’s Black Beyond Measure initiative, which highlights dozens of Black-founded brands and connects business owners to a program designed to “democratize access to retail education,” remains active.
But Target’s critics, including Minneapolis-based civil rights attorney Nekima Levy Armstrong, view the move as a surrender to the new presidential administration’s attack on equity programs. In a news conference outside Target’s Minnesota headquarters on Jan. 30, 2025, Armstrong called for a nationwide boycott of the store to begin on the first day of Black History Month.
While many social media users posted in support of the boycott, some Black founders whose brands are stocked by Target – and there are dozens of them – have been more conflicted. Tabitha Brown, whose products can be found in various aisles, from books to cooking appliances, asked customers to reconsider boycotting Target. Withholding their dollars, Brown insisted, will hurt Black businesses far more than the corporations that sell their products.
This request for restraint garnered a mixed response on social media. Some Black consumers accused Black business owners of selling out the very racial community that contributed to their success.
So, why would a Black business owner ask consumers to patronize a retailer that signaled it doesn’t care about Black customers? And how did something as mundane as where people buy toilet paper and shampoo become a litmus test for racial consciousness in the first place?
Black consumers and the fight for dignity
The marketplace has long been a battleground where Black Americans have sought to assert their citizenship. Most of the nation’s biggest household brands didn’t begin to take African American consumers seriously until after World War II. Before that shift, advertisements and product packaging were more likely to feature degrading Black caricatures to appeal to white shoppers, than to address Black consumers directly.
This segregated commercial landscape reinforced the belief among some community members that Black people would not be taken seriously as citizens until they were taken seriously as consumers. They would need to vote with their dollars, patronizing only those brands and retailers that respected them.
In my research on marketing campaigns aimed at Black women, I’ve examined how the struggle for consumer citizenship complicated the dynamic between Black entrepreneurs and consumers. On the one hand, businesses have long leveraged Black ownership as a unique selling proposition in and of itself, urging shoppers to view Black brand loyalty as a path to collective racial progress.
Unlike their larger competitors, Black entrepreneurs relied on their racial community to stay afloat. Patronizing African American businesses could therefore be framed as a racial duty. Conversely, as African American advertising pioneers made clear, recognition from big brands was a political victory of sorts because it signaled that Black dollars were just as valuable as anyone else’s. https://www.youtube.com/embed/SAFubUnsl3Y?wmode=transparent&start=0 A short documentary from The Advertising Club of New York featuring iconic ads from African American marketer Tom Burrell.
Competing for Black dollars
Corporate attention to Black consumers ebbs and flows in a cycle that is especially noticeable in the beauty and personal care industry. In seasons of limited competition for African American customers, entrepreneurs typically thrive, even while they struggle to meet the capital demands of a growing brand. Their success, however, beckons larger corporations, which then seek to capitalize on consumer niches they previously ignored.
Two common approaches that mass market brands pursue to compete for Black dollars include acquiring smaller, established Black brands and developing their own niche products. Large corporations deployed both strategies during a period of intense expansion into the beauty market of the 1980s.
Black owners tried to stave off their competition by creating a special emblem that alerted shoppers to their authenticity. Then, as now, social justice organizations, such as Rev. Jesse Jackson’s Operation PUSH, also initiated boycotts and urged Black consumers not to choose “lipstick over liberation.”
Nevertheless, many Black entrepreneurs sold their brands, and by 1986 nearly half of the Black hair care market was no longer Black-owned.
A linked fate
Parsing winners and losers within the world of Black enterprise is as difficult now as it was in earlier periods. African American business owners often possess a cultural consciousness that distinguishes their brands, even when they can’t match the resources of larger competitors. And as they figure out how to survive an uneven playing field, Black entrepreneurs sometimes face accusations of betraying their racial community.
In a market governed by the law of supply and demand, Black consumers benefit from increased competition. Yet, racial loyalty sometimes asks that they eschew these benefits for the sake of keeping Black dollars in Black hands.
Four years ago, when Target launched its Black Beyond Measure funding initiative, it seemed that the retailer had struck a rare balance in supporting Black brands and their customers. In addition to curating a collection of products to lure shoppers, Target used the campaign as an opportunity to position entrepreneurs to flourish well beyond Black History Month.
Now, as Black consumers and business owners weigh varying responses to the retailer’s decision to reverse their commitment to DEI values, one question endures: Do Black dollars matter?
Timeka N. Tounsel, Associate Professor of Black Studies in Communication, University of Washington
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Consumer Corner
Trump’s opening tariff salvo will hurt US consumers − following through on Canada, Mexico threats will increase the price pain

Jason Reed, University of Notre Dame
If U.S. voters reelected Donald Trump hoping for relief from higher prices, his recent threats to impose tariffs on America’s three largest trade partners might make them think again.
On Saturday, Feb. 1, Trump announced 25% tariffs on Canada and Mexico and 10% tariffs on China, which he said would take effect on Tuesday, Feb. 4. While markets braced for the news to some degree, they still saw a steep premarket sell-off on Monday, Feb. 3, followed by morning volatility.
While Canada and Mexico negotiated monthlong reprieves on Monday, the new tariffs on China went into effect as expected Tuesday, Feb. 4. And while the ultimate shape of Trump’s tariff policy remains to be seen, the president warned that American consumers could feel “some pain” as a result.
Given my training as an economist and finance professor, I think Trump could be right on that score. In fact, if the tariffs go into effect, they could spell disaster for the Federal Reserve’s inflation reduction efforts.
From grocery stores to homes
U.S. consumers might be surprised to find out that almost every economic sector could be affected by this opening salvo of tariffs, should they go ahead in March. Imports from Mexico and Canada reached close to US$1 trillion in 2024, almost double the amount the U.S. imports from China.
The U.S. is particularly reliant on Mexico for fresh fruits and vegetables, and on Canada for lumber. So if the tariffs go into effect, Americans who have been waiting for home prices to ease may have to continue waiting, as tariffs on lumber and other building materials could worsen the affordable-housing crunch. And let’s not even talk about avocado prices.
Meanwhile, the 10% tariffs on Chinese goods will likely boost the price of electronics, and China has already imposed retaliatory measures. Trump has also proposed 25% tariffs on Taiwan and its semiconductor industry, in an attempt to push Taiwanese companies to invest more in U.S. manufacturing. If that tariff were to go into effect, prices for U.S. consumers would be even higher.
A tax by any other name …
Tariffs are an import tax. They’re passed through the supply chain in the form of higher prices and are eventually paid by consumers. Traditionally, governments have used tariffs as a fiscal tool to encourage businesses and consumers to move away from foreign-made products and support domestic businesses instead.
In theory, new tariffs could encourage foreign businesses to invest in the U.S. and make more stuff on American soil. Unfortunately, domestic manufacturing has seen a systemic decline since the 1980s, resulting in lower prices for consumers but severely limiting U.S.-produced products. In the short term, at least, import taxes on Canadian, Mexican and Chinese products would ultimately be paid by U.S. consumers.
Although this round of tariff threats may seem arbitrary to some, the Trump administration says it considers tariffs deeply intertwined with national security concerns. Stephen Miran, Trump’s pick to chair the president’s Council of Economic Advisers, has laid out a path for Trump’s tariff plan, which he says is aimed at putting American industry on fairer ground against the rest of the world.
In the long term, it’s unclear whether Trump’s threatened trade war will bring domestic manufacturing back to the U.S. and start a new industrial renaissance. In the meantime, American consumers will likely be stuck holding the bag.
Jason Reed, Associate Teaching Professor of Finance, University of Notre Dame
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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