Water

Environmental engineers have developed critical methods to remove toxic selenium from water.

A long period of drought in North America has been recognized by scientists for decades. A new study links the severe climate to a change in Earth's orbit.

A new study of the 28 most populous U.S. cities finds that all are sinking to one degree or another. The cities include not just those on the coasts, where relative sea level is a concern, but many in the interior. Furthermore, using newly granular data, the study finds that some cities are sinking at different rates in different spots, or sinking in some places and rising in others, potentially introducing stresses that could affect buildings and other infrastructure.

An edible robot leverages a combination of biodegradable fuel and surface tension to zip around the water's surface, creating a safe -- and nutritious -- alternative to environmental monitoring devices made from artificial polymers and electronics.

Scientists have found that a mere 30 species of trees in the Cerrado -- the world's largest and most floristically diverse savanna -- account for nearly half of all its trees. The 'hyperdominance' by a few species could help researchers understand how this vast ecosystem functions.

A new technique to extract tiny cellulose strands from cow dung and turn them into manufacturing-grade cellulose, currently used to make everything from surgical masks to food packaging, has been developed.

Across the globe, monsoon rainfall switches on in spring and off in autumn. Until now, this seasonal pattern was primarily understood as an immediate response to changes in solar radiation. A new study shows that the atmosphere can store moisture over extended periods, creating a physical memory effect. It allows monsoon systems to flip between two stable states. Disrupting this delicate balance, would have severe consequences for billions of people in India, Indonesia, Brazil and China.

Parasites are crucial indicators of ecosystem health, and their absence can signal trouble. Once pristine, Florida's Indian River Lagoon (IRL) now faces pollution and algal blooms that have damaged essential habitats like seagrass beds. New research finds parasite levels in the IRL are significantly lower than in comparable ecosystems worldwide -- 11% lower overall and 17% lower for larval parasites requiring multiple hosts. This sharp decline suggests a disrupted food web likely caused by pollution and habitat degradation, and a less resilient and more vulnerable ecosystem.

Researchers have outlined a bold new roadmap for harnessing heterogeneous catalysis to destroy per- and polyfluoroalkyl substances (PFAS), the so-called 'forever chemicals' that have contaminated water supplies worldwide.

Engineers have invented a sponge-like device that captures water from thin air and then releases it in a cup using the sun's energy, even in low humidity where other technologies such as fog harvesting and radiative cooling have struggled. The water-from-air device remained effective across a broad range of humidity levels (30 -- 90%) and temperatures (5 -- 55 degrees Celsius).

Researchers have released their 2024 U.S. sea level 'report cards,' providing updated analyses of sea level trends and projections for 36 coastal communities. Encompassing 55 years of historical data in a new, interactive dashboard, the report cards aid planning and adaptation efforts by forecasting rates of sea level rise to 2050.

Converting forest land to urban development or agricultural use can present risks to water quality when done near streams or river sources. This study examined data from 15 water treatment plants in the Middle Chattahoochee watershed to model the impacts of four potential land use scenarios several decades into the future.

A new technique that uses soundwaves to separate materials for recycling could help prevent potentially harmful chemicals leaching into the environment.

Hydrologists show most streamflow out of the West's mountains is old snowmelt on a multi-year underground journey. New study finds that spring runoff is on average 5 years old.

Could the artificial introduction of oxygen revitalise dying coastal waters? While oxygenation approaches have already been proven successful in lakes, their potential side effects must be carefully analysed before they can be used in the sea. This is the conclusion of researchers from GEOMAR Helmholtz Centre for Ocean Research Kiel and Radboud University in the Netherlands. In an article in the scientific journal EOS, they warn: Technical measures can mitigate damage temporarily and locally, but they are associated with considerable uncertainties and risks. Above all, they do not offer a permanent solution because the oxygen content will return to its previous level once the measures end, unless the underlying causes of the problem, nutrient inputs and global warming, are not tackled.

Some red algae exhibit structural color that gives their growth tips a blue hue and the rest of their bodies including their fruiting structures a white hue. Moreover, since the color-producing structures are located together with anti-herbivory chemicals, the discovery further suggests that red algae use colors for inter-species communication.

For the cautious -- or simply curious -- homeowner, an at-home water testing kit may seem reassuring. But there are high levels of variability between test kits' abilities to detect potential contaminants in water, a new study has found.

Endemic to China's Yangtze River, the Yangtze finless porpoise is known for its intelligence and charismatic appearance; it looks like it has a perpetual smile on its face. To track how this critically endangered porpoise's habitat range has changed over time, a team of biodiversity and conservation experts compiled 724 ancient Chinese poems referencing the porpoise from historic collections across China. Their results show that the porpoise's range has decreased by at least 65% over the past 1,400 years, with the majority of this decline occurring in the past century.

New research shows that elevation changes and earthquakes in Italy's Campi Flegrei volcanic area are caused by rising pressure in a geothermal reservoir -- not magma or its gases, as commonly thought. Channeling water runoff or lowering groundwater levels could reduce risks for surrounding communities.

The disappearance of sea ice in polar regions due to global warming not only increases the amount of light entering the ocean, but also changes its color. These changes have far-reaching consequences for photosynthetic organisms such as ice algae and phytoplankton.

The world's oceans are heating faster in two bands stretching around the globe, one in the southern hemisphere and one in the north, according to climate scientists.

The well-known salmon life cycle has long been described as going only one way at a time. Juvenile salmon hatch and swim down rivers to the ocean, where they grow and mature before returning to the same river to spawn the next generation. Turns out that many young salmon do things differently.

Scientists have discovered, for the first time how root cells respond to their complex soil environment revealing that roots actively sense their microenvironment and mount precise, cell-specific molecular responses. The findings could help the development crops that are resistant to climate stress.

In what could represent a milestone in ecological restoration, researchers have implemented a method capable of restoring peatlands at tens of thousands of oil and gas exploration sites in Western Canada. The project involves lowering the surface of these decommissioned sites, known as well pads, and transplanting native moss onto them to effectively recreate peatlands. This is the first time researchers have applied the method to scale on an entire well pad. The study found that the technique results in sufficient water for the growth of peatland moss across large portions of the study site.

In the warm summertime waters of Lake Erie, cyanobacteria, or blue-green algae, can proliferate out of control, creating algal blooms that produce toxins at a rate that can harm wildlife and human health.

A more efficient and environmentally friendly approach to extracting rare earth elements that power everything from electric vehicle batteries to smartphones could increase domestic supply and decrease reliance on costly imports.

An international team of scientists has moved beyond just 'scratching the surface,' to understand how microplastics move through and impact the global ocean. For the first time, scientists have mapped microplastic distribution from the surface to the deep sea at a global scale -- revealing not only where plastics accumulate, but how they infiltrate critical ocean systems. Researchers synthesized depth-profile data from 1,885 stations collected between 2014 and 2024 to map microplastic distribution patterns by size and polymer type, while also evaluating potential transport mechanisms.

With more than 181.5 billion tons of wood produced globally each year, a new method could revolutionize how we build sustainably. By infusing red oak with ferrihydrite using a simple, low-cost process, researchers strengthened the wood at the cellular level without adding weight or altering flexibility -- offering a durable, eco-friendly alternative to steel and concrete. The treated wood retains its natural behavior but gains internal durability -- paving the way for greener alternatives in construction, furniture and flooring.

Flash floods resulting from extreme rainfall pose a major risk to people and infrastructure, especially in urban areas. Higher temperatures due to global climate change affect continuous rainfall and short rain showers in somewhat equal measure. However, if both types of precipitation occur at the same time, as is typical for thunderstorm cloud clusters, the amount of precipitation increases more strongly with increasing temperature, as shown in a recent study.

A powerful earthquake, combined with rising sea levels, could significantly increase flood risks in the Pacific Northwest, impacting thousands of residents and properties in northern California, Oregon, and Washington, according to new research. The study found that a major earthquake could cause coastal land to sink up to 6.5 feet, expanding the federally designated 1 percent coastal floodplain, an area with a 1-in-100 chance of flooding each year, by 35 to 116 square miles.

Like farmland in Australia, native forests struggle with drought and flooding, so future management decisions need more sophisticated systems to monitor and manage their water needs. A new study aims to provide a good estimate of water used by trees and plants and bushes under the treetops (or the forest understorey) to help improve management of native woodlands.

When bottom trawls are dragged across the seafloor, they stir up sediments. This not only releases previously stored organic carbon, but also intensifies the oxidation of pyrite, a mineral present in marine sediments, leading to additional emissions of carbon dioxide (CO2).

Paper shares innovative natural capital accounting approach to valuing the benefits of ecosystems in Colombia's Upper Sin Basin to key economic sectors.

Florida's Lake Okeechobee is essential for water management but faces harmful algal blooms, which thrive in warm, nutrient-rich waters. Daily vertical migration enables them to survive in turbid conditions. A new study using a physical-biogeochemical model reveals that cyanobacteria move toward the surface for sunlight in the morning, boosting growth, and are redistributed by wind and mixing at night. This daily migration, combined with temperature and wind patterns, influences bloom development, offering insights to better monitor and manage harmful algal blooms.

Dust-on-snow is a major threat to water in the Colorado River, yet no snowmelt forecasts integrate dust-accelerated melt. Using pioneering remote sensing techniques, new research is the first to capture how dust impacts the headwaters of the Colorado River system. The new method could help predict the timing and magnitude of snow darkening and impacts on melt rates on snowpacks, in real time.

Despite advances in wastewater treatment, tiny plastic particles called microplastics are still slipping through, posing potential health and environmental hazards, according to new research.

Microplastics, tiny plastic particles found in everyday products from face wash to toothpaste, are an emerging threat to health and ecology, prompting a research team to identify what keeps them trapped in stream ecosystems.

As farmers debate whether fields should be used for agriculture or solar panels, new research says the answer could be both. Scientists analyzed remote sensing and aerial imagery to study how fields have been used in California for the last 25 years. Using databases to estimate revenues and costs, they found that farmers who used a small percentage of their land for solar arrays were more financially secure per acre than those who didn't.

The consequences of wildfires in or near urban areas go beyond the damage to buildings and ecosystems, to the threat of contamination of drinking water according to water quality and treatment experts.

Lake ecosystems can receive high inputs of terrestrial organic matter (t-OM) that microbes make available to higher trophic level consumers. A research group examined terrestrial reliance of 19 consumer groups from 35 boreal lakes using stable isotopes of hydrogen. According to the study, benthic macroinvertebrates and the benthivorous fish reliance to terrestrial energy (allochthony) was higher compared to pelagic plankton and planktivorous fish. Consumer allochthony decreased along the environmental gradient from forested to agricultural catchments, likely due to alteration in the origin of lake organic matter.

Using advanced DNA sequence analysis, a research team has discovered that tiny organisms in Brooklyn's highly contaminated Gowanus Canal have developed a comprehensive collection of pollution-fighting genes. This finding suggests the potential of a cheaper, more sustainable, and less disruptive method for cleaning contaminated waterways than the current oft-used dredging operations.

Researchers have helped overturn the popular theory that water on Earth originated from asteroids bombarding its surface; Scientists have analyzed a meteorite analogous to the early Earth to understand the origin of hydrogen on our planet. The research team demonstrated that the material which built our planet was far richer in hydrogen than previously thought. The findings support the theory that the formation of habitable conditions on Earth did not rely on asteroids hitting the Earth.

When two materials come into contact, charged entities on their surfaces get a little nudge. This is how rubbing a balloon on the skin creates static electricity. Likewise, water flowing over some surfaces can gain or lose charge. Now, researchers have harnessed the phenomenon to generate electricity from rain-like droplets moving through a tube. They demonstrate a new kind of flow that makes enough power to light 12 LEDs.

A new study reveals the impact of what might may be precursors to harmful contaminants in drinking water, formed during water disinfection.

Researchers conducted three years of extensive fieldwork to develop the first data-driven map of both newly documented and predicted peatlands across Colombia's eastern lowlands.

Desalination plants, a major and growing source of freshwater in dry regions, could produce less harmful waste using electricity and new membranes.

Microplastics and the much smaller nanoplastics enter the human body in various ways, for example through food or the air we breathe. A large proportion is excreted, but a certain amount remains in organs, blood and other body fluids. Scientists have now been able to develop a method for detecting and quantifying nanoplastics in transparent body fluids and determining their chemical composition.

A new study has shed unprecedented light on the highly variable and climate-sensitive routes that substances from Siberian rivers use to travel across the Arctic Ocean. The findings raise fresh concerns about the increasing spread of pollutants and the potential consequences for fragile polar ecosystems as climate change accelerates.

Engineers have created a sophisticated computer model that tracks how water moves in estuaries -- which is critical for evaluating climate variability and sea level fluctuation impacts for coastal communities.

O'ahu's sandy beaches are at risk. New research has determined that 81% of O'ahu's coastline could experience erosion by 2100, with 40% of this loss happening by 2030. Importantly, these forecasts of shoreline erosion are more extreme than previous studies indicated for O?ahu.

What is the role of dissolved organic matter in the deep sea? In a study relating to this question, researchers have investigated the composition of dissolved organic matter (DOM) in detail. Their samples were obtained during an expedition to the Guaymas Basin in the Gulf of California.

Urgent action is needed to protect endangered species, human health and industry from the impacts of the Caspian Sea shrinking, research has found.

Bacteria play key roles in degrading organic matter, both in the soil and in aquatic ecosystems. While most bacteria digest large molecules externally, allowing other community members to share and scavenge, some bacteria selfishly take up entire molecules before digesting them internally. Researchers now document 'selfish polysaccharide uptake' in freshwater ecosystems.

New technology could enable more sustainable and cheaper production of bio-oils to replace petroleum-based products in electronic, construction and automotive applications. The technology, known as PYROCOTM, uses high temperatures without oxygen to convert treated sewage (biosolids) into a carbon-rich product called biochar, which can act as a catalyst to produce phenol-rich bio-oil.

Engineers have hit the trifecta of sustainability technology: A group has developed a low-cost method to produce carbon-free 'green' hydrogen via solar-powered electrolysis of seawater. A happy byproduct of the process? Potable water.

Wild fig tree rings offer a cheap method for tracking toxic atmospheric mercury, a byproduct of gold mining in the Global South, according to a new study.

'Forever chemicals' are everywhere. But only a handful have been evaluated for potentially toxic effects. Researchers think there may be a faster, cheaper way to figure out which ones might be hazardous to our health -- using worms.

Wear and tear on plastic products releases small to nearly invisible plastic particles, which could impact people's health when consumed or inhaled. To make these particles biodegradable, researchers created plastics from plant starch instead of petroleum. An initial study shows how animals consuming particles from this alternative material developed health problems such as liver damage and gut microbiome imbalances.

New research into the overlooked environmental impact of pet dogs has found far-reaching negative effects on wildlife, ecosystems and climate.

Evidence shows that hunter-gatherers were crossing at least 100 kilometers (km) of open water to reach the Mediterranean island of Malta 8,500 years ago, a thousand years before the arrival of the first farmers.