News
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.
Last Updated on April 11, 2026 by Daily News Staff
April 10, 2026 — NASA’s Artemis II crew has safely returned to Earth, marking the successful completion of the first crewed mission to the Moon’s vicinity in more than 50 years.
Credit: NASA/Joel Kowsky
The Orion spacecraft splashed down in the Pacific Ocean off the coast of California at 5:07 p.m. PDT, carrying NASA astronauts Reid Wiseman, Victor Glover, Christina Koch, and Canadian astronaut Jeremy Hansen back home after a nearly 10-day journey through deep space.
🚀 A Mission for the Record Books
During the mission, the crew traveled a total of 694,481 miles, reaching a maximum distance of 252,756 miles from Earth—farther than any humans have ever gone, surpassing the Apollo 13 record set in 1970.
Launched on April 1 aboard NASA’s powerful Space Launch System (SLS) rocket, Artemis II tested critical systems needed for future missions, including life support, navigation, and deep space communication.
🌕 Science, Exploration, and Stunning Views
While orbiting the Moon, the astronauts captured more than 7,000 images, including views of the lunar far side, a rare solar eclipse, and detailed observations of craters, lava flows, and surface features.
The mission also included scientific experiments to better understand how the human body responds to deep space conditions, helping prepare for longer missions to the Moon and Mars.
🛰️ Safe Return and Recovery
Following splashdown, recovery teams quickly reached the spacecraft and transported the crew by helicopter to the USS John P. Murtha for initial medical evaluations. The astronauts are expected to return to NASA’s Johnson Space Center for further assessments.
🌍 What Comes Next
With Artemis II complete, NASA is now turning its focus to Artemis III, the next mission aimed at landing astronauts on the Moon and establishing a long-term human presence.
The success of Artemis II marks a major step forward in humanity’s return to deep space—and the beginning of a new era of exploration.
For more information on NASA’s Artemis program, visit the official NASA website.
🔗 Source & Further Reading
- NASA Blog: Artemis II Flight Day 10 – Re-entry Live Updates
- NASA Artemis II Mission Overview
- NASA Artemis Program – Return to the Moon
- Orion Spacecraft Details and Technology
- NASA Image and Video Library (Artemis II Photos & Media)
Dive into “The Knowledge,” where curiosity meets clarity. This playlist, in collaboration with STMDailyNews.com, is designed for viewers who value historical accuracy and insightful learning. Our short videos, ranging from 30 seconds to a minute and a half, make complex subjects easy to grasp in no time. Covering everything from historical events to contemporary processes and entertainment, “The Knowledge” bridges the past with the present. In a world where information is abundant yet often misused, our series aims to guide you through the noise, preserving vital knowledge and truths that shape our lives today. Perfect for curious minds eager to discover the ‘why’ and ‘how’ of everything around us. Subscribe and join in as we explore the facts that matter. https://stmdailynews.com/the-knowledge/
The Knowledge
Artemis II’s long countdown – a space historian explains why it has taken over 50 years to return to the Moon
Why has it taken 50+ years to return to the Moon? A space historian explains the technical, political, and financial complexities behind Artemis II’s long journey.
Last Updated on April 10, 2026 by Daily News Staff
Emily A. Margolis, Smithsonian Institution
While I was leading a tour of the National Air and Space Museum in January 2026, a visitor posed this insightful question: “Why has it taken so long to return to the Moon?”
After all, NASA had the know-how and technology to send humans to the lunar surface more than 50 years ago as part of the Apollo program. And, as another tour guest reminded us, computers today can do so much more than they could back then, as evidenced by the smartphones most of us carry in our pockets. Shouldn’t it be easier to get to the Moon than ever before?
The truth is that sending humans into space safely continues to be difficult, especially as missions increase in complexity.
New technologies require years of study, development and testing before they can be certified for flight. And even then, systems and materials can behave in ways that surprise and worry engineers and mission planners; look no further than Boeing’s Starliner CFT mission or the performance of the Orion heat shield on Artemis I.
Issues with Starliner’s thrusters led NASA to return the spacecraft from the International Space Station without its crew. Unanticipated chipping of the Orion heat shield resulted in years of research, culminating in NASA altering the atmospheric reentry plans for the Artemis II mission.
NASA’s programs also require sustained political will and financial support across multiple presidential administrations, Congresses and fiscal years. As a historian of human spaceflight, I have studied the space agency’s efforts to engage the broader public to convince American taxpayers that their programs hold value for the nation.
NASA is now on the eve of the first crewed flight to the Moon since the Apollo era: Artemis II. A crew of four will conduct a lunar flyby, laying the groundwork, the agency hopes, for a landing on the Artemis IV mission.
The story of NASA’s effort to return humans to the Moon is long and winding, demonstrating the complexities of turning grand ambitions into real missions.
Post-Apollo
In early 1970, with two successful Moon landings on the books, President Richard Nixon sought to reduce NASA’s budget to better align with his administration’s priorities. This decision put the space agency in a difficult position, which ultimately led to the cancellation of three planned Apollo missions to conserve funding for its plans for long-term human activity in low Earth orbit.
NASA repurposed the third stage of a Saturn V rocket to create the first U.S. space station, Skylab, which operated from 1973 to 1974. The space agency used leftover Saturn IB rockets and Apollo command and service modules to send crews to the station.
Over the next three decades, NASA developed and operated the space shuttle. The fleet of space shuttle orbiters supported satellite deployment and microgravity research on orbital missions of up to 17 days. This work was meant to enable future long-duration human missions and provide benefits to people on Earth. For example, data from protein crystal growth experiments have informed the development of medicines.
The space shuttle program facilitated the construction, maintenance and staffing of a continuously inhabited research platform in orbit, the International Space Station. The first modules launched in late 1998.
Where to next?
As the new millennium approached, the Clinton administration tasked NASA to think beyond the space station. What could robots and humans do next in space? And where could they do it? Notably, the White House expressed an interest in locations beyond low Earth orbit.
NASA, it turned out, was well positioned to meet the administration’s request. NASA Administrator Daniel Goldin was already thinking about preparing proposals for the next presidential administration and had recently sponsored a human lunar return study. In 1999, he established a team to investigate new technologies, missions and destinations for the 21st century.
This work took on new significance following the tragic loss of the space shuttle Columbia crew in February 2003. Many people, including those in the new George W. Bush White House, wondered whether the human spaceflight program should continue – and, if so, how.
Administration discussions culminated in Bush’s Vision for Space Exploration in 2004, which directed NASA to retire the space shuttle after the completion of the space station. It called for returning humans to the Moon on a crew exploration vehicle designed for destinations beyond low Earth orbit.
It also called for continuing robotic exploration of Mars and engaging companies and international partners in space. Fifteen years earlier, President George H. W. Bush had also announced a Moon and Mars exploration program, but congressional concerns about cost kept space travelers close to home.
The Constellation program’s legacy
In December 2004, NASA began the process of finding a manufacturer for the crew exploration vehicle. By August 2006, the space agency awarded Lockheed Martin the contract to build the capsule, which it had named Orion – the same Orion planned to carry Artemis astronauts to the Moon.
Years of research, development and testing followed for Orion as well as the Ares I crew and Ares V cargo launch vehicles. Together, these technologies made up the Constellation program.
Constellation had two primary objectives: in the near term, to help transport crew to and from the space station after the space shuttle program ended; in the long term, to enable human lunar exploration.
Building systems that could work in both Earth orbit and around the Moon was supposed to save the time and cost of developing two vehicles. Similarly, adapting space shuttle program hardware could supposedly cut costs.
During the first months of Barack Obama’s presidency in 2009, the administration initiated an independent review of NASA’s human spaceflight plans. The Augustine Committee, chaired by retired aerospace executive Norman Augustine, found that the agency’s ambitions outstripped its limited budget, leading to significant delays. The first Orion spacecraft was likely to arrive after the space station ceased operations.
The committee proposed several paths forward at the current funding level, which prioritized space shuttle and space station programs. An additional annual investment of US$3 billion would allow for human exploration beyond low Earth orbit.
Ultimately, the Obama administration canceled Constellation, but two of its technologies lived on, thanks to U.S. senators from states that would have been affected by cuts.
The NASA Authorization Act of 2010 funded Orion’s continued development, shifting responsibility for space station crew transportation to commercial vehicles. It also directed NASA to develop the space launch system, a redesigned Ares V heavy booster, to send Orion to the Moon. The technical strategy had political benefits, too, preserving jobs in numerous congressional districts by providing continuity for aerospace contractors.
In December 2014, a Delta IV heavy rocket launched the first Orion capsule on a test flight, providing engineers with data on spacecraft systems and the heat shield. By October 2015, the space launch system had completed a critical design review, the last step before manufacturing could begin.
Introducing Artemis
In December 2017, the new Trump administration issued a policy directive shifting the focus of NASA’s human spaceflight program back to the Moon. The space agency would use Orion and the space launch system in a race to meet an ambitious 2024 landing date. NASA officially named the program Artemis in May 2019.
The 25-day Artemis I mission, launched in November 2022, was a major milestone for the program. This uncrewed flight was the first flight of the space launch system and the first to integrate SLS and Orion. It laid the groundwork for Artemis II, which will be the first crewed flight of the SLS.
Over more than 50 years, each new presidential administration has reassessed the place of spaceflight among its priorities, either encouraging or curtailing NASA’s efforts to return humans to the lunar surface.
Each crewed flight requires the alignment of technical expertise, political will and financial support over years if not decades. For the space fans who plan to watch the Artemis II launch, the wait for countdown may feel long. But it’s just a blink in NASA’s long journey back to the Moon.
Emily A. Margolis, Curator of Contemporary Spaceflight, National Air and Space Museum, Smithsonian Institution
This article is republished from The Conversation under a Creative Commons license. Read the original article.
Dive into “The Knowledge,” where curiosity meets clarity. This playlist, in collaboration with STMDailyNews.com, is designed for viewers who value historical accuracy and insightful learning. Our short videos, ranging from 30 seconds to a minute and a half, make complex subjects easy to grasp in no time. Covering everything from historical events to contemporary processes and entertainment, “The Knowledge” bridges the past with the present. In a world where information is abundant yet often misused, our series aims to guide you through the noise, preserving vital knowledge and truths that shape our lives today. Perfect for curious minds eager to discover the ‘why’ and ‘how’ of everything around us. Subscribe and join in as we explore the facts that matter. https://stmdailynews.com/the-knowledge/
Economy
Feeding the Economy Report Says U.S. Food, Agriculture Add $10.4 Trillion
The 2026 Feeding the Economy report says U.S. food and agriculture industries generate $10.4 trillion in economic value and support 48.7 million jobs.
New Feeding the Economy Report Highlights Food, Agriculture Industry Strength
America’s food and agriculture industries generated more than $10.4 trillion in economic value in 2026, accounting for nearly 20% of the U.S. economy, according to the 10th annual Feeding the Economy report released by 35 food and agriculture groups. The new farm-to-fork study also found the sector supports 48.7 million jobs nationwide, including 24.3 million direct jobs across farming, food manufacturing, processing, distribution, retail, and foodservice.
The report points to continued resilience despite inflation, trade uncertainty, and ongoing pressure on farmers and producers. It found food and agriculture generate more than $3 trillion in wages and $1.35 trillion in tax revenue, while U.S. exports totaled $177.3 billion. At the same time, the study flagged softer areas to watch, including flat direct employment in production agriculture and food manufacturing, along with a year-over-year decline in exports. For the food and beverage industry, the report reinforces just how deeply agriculture remains tied to jobs, supply chains, and broader economic stability.
Source:
Tenth Annual “Feeding the Economy” Report Demonstrates Strength and Resilience of the American Food and Agriculture Industries Amid Ongoing Economic Pressures — Feeding the Economy via PR Newswire
Further information:
Feeding the Economy
View the original press release on PR Newswire
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