A study published in Nature found that thick marine beds of siderite suggest early high carbon dioxide levels in the atmosphere. The research suggests that the atmospheric carbon dioxide concentration was more than 100 times greater than today, causing acidic ocean water and maintaining liquid oceans.
Scientists have quantified the transport of carbon from surface waters to the deep ocean in response to iron fertilization. The study found that while iron fertilization can enhance carbon flux and reduce atmospheric carbon dioxide levels, the quantities removed are no greater than natural plankton blooms, making it a limited solution.
Researchers found that conservation tillage increases soil carbon, reducing greenhouse gas emissions. This method also produces more food with less land, addressing global food security challenges.
The AAAS panel on human-nature interactions examines six NSF-supported projects focusing on urban development, Polynesian culture, and shoreline development. Biocomplexity researchers discuss the linkages between human behaviors and natural systems, highlighting the importance of interdisciplinary approaches and new technologies.
Scientists discovered bacteria in deep drill holes on Earth, suggesting similar conditions exist on Mars. The findings imply that microorganisms can thrive in extreme environments, increasing the chances of life existing beyond our planet.
MESSENGER, NASA's first Mercury orbiter mission, is set to begin prelaunch tests at Goddard Space Flight Center. The spacecraft will undergo environmental testing and shake-and-bake tests to prepare it for its May 2004 launch and a yearlong study of Mercury.
A recent study found no change in methylmercury levels in yellowfin tuna over a 27-year period, suggesting that high mercury levels in these fish may not be caused by pollution. The research suggests that natural sources, such as hydrothermal vents and deep ocean sediments, could be responsible for the mercury accumulation.
Researchers are using stable isotopes in bird feathers to track migration patterns and wintering grounds, revealing previously unknown information about bird dispersal. This technique provides a faster and more cost-effective alternative to traditional methods like banding, allowing scientists to gather data on a wider scale.
A recent study published in Nature announces a major advance in the study of Amazon Basin's hydrology and geochemistry dynamics. The research partnership has yielded precise measurements of water, sediment, and geochemical inputs contributed by the Amazon's main tributaries.
The Gaza Strip's groundwater is becoming contaminated with salts and nitrates due to over-pumping, threatening the water supply. A joint study suggests tapping into saline water from Israel and desalinating it could help preserve freshwater resources and alleviate pressure on the aquifer.
Emerging life played a role in moderating ice ages that resulted in today's moderate climate. Microscopic marine plants and animals that produce calcium carbonate skeletons and shells help regulate aquatic chemistry, controlling the amount of carbon dioxide in the atmosphere.
Researchers at Virginia Tech used an atomic force microscope to measure the sticking efficiency of live Enterococcus faecalis bacteria. They found that the bacteria were surprisingly robust and could withstand various conditions, which can help design more effective filters for water treatment.
The UCLA Center for Astrobiology will focus on four themes: extrasolar planetary systems, habitability of planets and their satellites, Earth's early environment and life, and evolution of biological complexity. The center aims to detect planets beyond our solar system using new methods and study the factors that control habitability.
Researchers DePaolo and Manga argue that mantle plumes are the primary cause of volcanic activity on Earth. They cite strong evidence from Hawaii and other hotspots, including rapid magma movement and unique chemical signatures. The debate highlights the importance of understanding plume origins for connecting seismology and geochemistry.
Researchers suggest that life emerged from chemical reactions in deep ocean environments, challenging traditional views of cell evolution. The theory proposes that inorganic iron sulphide cells were the first to form and eventually gave rise to living cells.
Researchers propose that Oxygen-making microbes came later, around 100 million years after the emergence of Sulfur-loving bacteria. This revised evolutionary history may explain the lack of cyanobacteria fossils in ancient iron formations and resolve biochemical contradictions.
The study reveals how aluminum floc forms in polluted streams, binding to toxic metals and transporting them downstream, harming fish and other aquatic animals. Understanding the molecular pathways of this process may lead to practical solutions to prevent the reactions.
Researchers have developed a new microscope technology to study the interaction between biomolecules and minerals. The study focuses on Azotobacter vinelandii, a bacterium that releases siderophores to acquire iron from minerals. The findings suggest that these molecules can also dissolve minerals and potentially remove toxic metals, l...
Researchers at UC Davis and UC Santa Barbara have discovered a link between rapid changes in ocean carbon chemistry during the last ice age and shifts in ocean circulation. The study sheds light on how human-induced global warming may affect ocean currents, weather patterns, and climate worldwide.
The MESSENGER project has passed a critical design review and is ready to move forward with building its spacecraft. The spacecraft will study Mercury's composition, geologic history, and magnetosphere over a one-year orbit, providing valuable insights into the inner solar system.
Researchers found that small island rivers in Taiwan and New Zealand produce high amounts of sediment, potentially impacting global climate change. The amount of sediment varies greatly between rivers, with the Cropp River in New Zealand producing 32,000 tons per square kilometer.
Hochella will analyze samples from acid-mine drainage sites in Germany and the US using advanced equipment to develop better models of metal transport. This work aims to improve understanding of toxic-metal-bearing phases and their distribution in drainage systems.
By analyzing seismic waves, scientists have mapped the physical properties of the earth below, identifying regions with seismically fast mantle that produce gem-quality diamonds. This discovery could aid in locating new diamond mines by targeting areas with similar characteristics.
Researchers from UCLA and Curtin University of Technology found ancient zircons in a rock that suggest liquid water existed on Earth's surface around 4.3 billion years ago. This discovery supports the idea that the conditions for life were met early on, possibly allowing for the emergence of life as early as 4.3 billion years ago.
Researchers found ancient soil in South Africa with organic carbon dating back 2.6-2.7 billion years, indicating microbial mats developed on land during rainy seasons. The findings suggest the development of terrestrial biomass more than 1.4 billion years earlier than previously reported.
Researchers at University of Illinois used polymerase chain reaction to detect microbes in water, rock, and air samples from hot springs. They found evidence of life in new springs, suggesting microbes may have been transported by wind-borne steam or existing waters.
Research on MTBE contamination highlights the need for alternatives to this toxic fuel additive. Studies show that MTBE degrades slowly in sediments, but can be rapidly degraded by bacteria with oxygen addition.
Researchers at Idaho National Laboratory have discovered that microorganisms can break down urea and promote the formation of calcite, trapping radioactive strontium-90. This process could be used to contain contaminant until it decays away, potentially providing a cheaper and safer alternative to surface extraction.
The Microbe-Mineral Group at Virginia Tech aims to discover conditions under which microbes release nutrients or contaminants from mineral surfaces. Researchers hope to advance bioremediation and control unwanted releases of phosphorus and other minerals.
JHU/APL's MESSENGER spacecraft will be the first to visit Mercury in over three decades, gathering data on the planet's density, atmosphere, and magnetosphere. The $286 million mission has potential applications in industry beyond scientific research.
A study by the High Pressure Mineral Physics Group at the Max Planck Institute for Chemistry revealed that at high pressures, elements with strong affinity for metallic iron (siderophilic elements) lose their characteristic behavior. This discovery suggests an alternative explanation for the abundance of these elements in the Earth's u...
The MIT researchers' new model explains minute differences in magma composition by shifting densities due to iron and silicon, offset by soaring temperatures. This resolves the long-standing debate on convection in the Earth's mantle, providing a new framework for further investigations.
Scientists estimate a small amount of life could have existed on Mars through chemical reactions over billions of years. They also explore the possibility of life on Europa, estimating lower energy availability than on Mars.
A recent USGS study found that a subalpine wetland in Colorado's Rocky Mountain National Park was a net source of carbon to the atmosphere during a two-year period, despite being a net carbon sink for thousands of years. The study suggests that climate change may be affecting the carbon balance of these wetlands.
Scientists confirm evidence of past water on Mars, including minerals and sedimentation patterns. Theories about the disappearing water include evaporation, seepage, or storage at Martian poles.
Researchers are analyzing the weathering of spent mushroom substrate over three years to assess leaching, organic composition, and nitrogen content. This study aims to improve the environmental sustainability of the mushroom industry by understanding the best ways to reuse this substrate.
Researchers have identified a mechanism to trap key industrial metals such as nickel, copper and zinc in soils, reducing their mobility. This discovery could lead to more effective cleanup techniques using traditional methods.