Following rapid warming in the late 20th century, this century has so far seen surprisingly little increase in the average temperature at the Earth’s surface. At first this was a blip, then a trend, then a puzzle for the climate science community. More than a dozen theories have now been proposed for the so-called global warming hiatus, ranging from air pollution to volcanoes to sunspots.
Just how much Arctic permafrost will thaw in the future and how fast heat-trapping carbon...
The sweet and salty aroma of sunscreen and seawater signals a relaxing trip to the shore. But...
Unanticipated economic benefits from the shale oil and gas boom could help offset the costs of substantially reducing the U.S.'s carbon footprint, Purdue Univ. agricultural economists say. Wally Tyner and Farzad Taheripour estimate that shale technologies annually provide an extra $302 billion to the U.S. economy relative to 2007, a yearly "dividend" that could continue for at least the next two decades, Tyner said.
As climate change alters habitats for birds and bees and everything in between, so too does the way humans decide to use land. Researchers have, for the first time, found a way to determine the potential combined impacts of both climate and land-use change on plants, animals and ecosystems across the country.
Putting three radars on a plane to measure rainfall may seem like overkill. But for the Integrated Precipitation and Hydrology Experiment field campaign in North Carolina recently, more definitely was better. The system is specifically designed to measure rain in difficult-to-forecast mountain regions, where a wide range of frequencies to need be covered so that researchers can detect the more than 30 varieties of rainfall.
From research stations drifting on ice floes to high-tech aircraft radar, scientists have been tracking the depth of snow that accumulates on Arctic sea ice for almost a century. Now that people are more concerned than ever about what is happening at the poles, research led by the Univ. of Washington and NASA confirms that snow has thinned significantly in the Arctic, particularly on sea ice in western waters near Alaska.
A Rice Univ. laboratory has provided proof that foam may be the right stuff to maximize enhanced oil recovery (EOR). In tests, foam pumped into an experimental rig that mimicked the flow paths deep underground proved better at removing oil from formations with low permeability than common techniques involving water, gas, surfactants or combinations of the three.
A Florida State Univ. geography professor has shown that climate change may be playing a key role in the strength and frequency of tornadoes hitting the United States. though tornadoes are forming fewer days per year, they are forming at a greater density and strength than ever before. Instead of one or two forming on a given day in an area, there might be three or four occurring.
The threat of toxins contaminating water supplies along western Lake Erie is far from over even after Toledo, Ohio, declared its water safe again. That's because the algae leaving behind the dangerous toxins each summer aren't supposed to peak until September. The chances of another water emergency over the next few months will depend on the winds, rains and temperatures that dictate how large the algae grow and where algae blooms end up.
Scientists have uncovered key attributes of so-called “brown carbon” from wildfires, airborne atmospheric particles that may have influenced current climate models that failed to take the material’s warming effects into account. The work was described by a collaborative team of researchers from Los Alamos National Laboratory, Carnegie Mellon Univ. and the Univ. of Montana in Nature Geosciences.
Aerosols, tiny particles in the atmosphere, play a significant role in Earth's climate, scattering and absorbing incoming sunlight and affecting the formation and properties of clouds. Currently, the effect that these aerosols have on clouds represents the largest uncertainty among all influences on climate change.
Inspired by the Red Queen in Lewis Carroll’s "Through the Looking Glass", collaborators from Illinois and Singapore improved a 35-year-old ecology model to better understand how species evolve. The new model, called a mean field model for competition, incorporates the “Red Queen Effect,” which suggests that organisms must constantly increase fitness in order to compete with other ever-evolving organisms in an ever-changing environment.
For decades, strategic seed collections that help preserve biodiversity have been guided by simple models that offer a one-size-fits-all approach for how many seeds to gather. A new study, however, has found that more careful tailoring of seed collections to specific species and situations is critical to preserving plant diversity. A new approach called simulation-based planning was used to recommend how seeds are saved and reintroduced.
By now, most scientists agree that the temperature of the planet is rising and that the increase is due to human activities. But the jury still out regarding the variability of that increase. Researchers using “big data” computational tools have recently taken a systematic approach to answering this question and their results point to both higher global temperatures and increasing variability among those temperature extremes.
As the climate warms and sea ice retreats, the North is changing. An ice-covered expanse now has a season of increasingly open water that is predicted to extend across the whole Arctic Ocean before the middle of this century. Storms thus have the potential to create Arctic swell. A Univ. of Washington researcher made the first study of waves in the middle of the Arctic Ocean, and detected house-sized waves during a September 2012 storm.
A hidden hazard lurks beneath many of the roughly 156,000 gas stations across the U.S. The hazard is corrosion in parts of underground gas storage tanks. In recent years, field inspectors in nine states have reported many rapidly corroding gas storage tank components such as sump pumps.
Norwegian explorer Roald Amundsen became the first man to reach the South Pole in December 1911. More than 100 years later, an international team of scientists that includes a NASA researcher has proven that air pollution from industrial activities arrived to the planet’s southern pole long before any human.
As the Obama administration weans the U.S. off dirty fuels blamed for global warming, energy companies have been sending more of America's unwanted energy leftovers to other parts of the world where they could create even more pollution. This fossil fuel trade threatens to undermine the president's strategy for reducing the gases blamed for climate change and also reveals a side effect of countries acting alone on a global problem.
The U.S. Geological Survey plans this summer and next to map the outer limits of the continental shelf, and also study underwater landslides that would help predict where and when tsunamis might occur. But environmentalists say it could cause the same type of marine life damage they fought unsuccessfully to prevent this month off the coast of New Jersey.
Many studies have shown the potential for global climate change to cut food supplies. But these studies have, for the most part, ignored the interactions between increasing temperature and air pollution. A new study shows that these interactions can be quite significant, suggesting that policymakers need to take both warming and air pollution into account in addressing food security.
Stanford Univ. biology Prof. Rodolfo Dirzo and his colleagues are warning that "defaunation" could have harmful downstream effects on human health. The planet's current biodiversity, the product of 3.5 billion years of evolutionary trial and error, is the highest in the history of life. But, Dirzo says, this may be reaching a tipping point.
Around 75% of the supposed functionless DNA in the human genome is transcribed into so-called non-coding RNAs, and little is known about their function. Now, researchers have demonstrated that the production of non-coding RNAs is precisely regulated. They suspect that non-coding RNAs might play a role in regulating cellular processes or in the modified immune response following exposure to environmental toxicants.
New research from North Carolina State Univ. shows that urban “heat islands” are slowly killing red maples in the southeastern U.S. One factor is that researchers have found warmer temperatures increase the number of young produced by the gloomy scale insect—a significant tree pest—by 300%, which in turn leads to 200 times more adult gloomy scales on urban trees.
In a recent study published in the Journal of Membrane Science, a Massachusetts Institute of Technology team reported that, contrary to popular support, forward osmosis desalination of seawater is significantly less energy efficient, compared to reverse osmosis. In forward osmosis, water is drawn from the seawater into a concentrated salt solution, known as a draw solution.
The globe is on a hot streak, setting a heat record in June. That's after the world broke a record in May. The National Oceanic and Atmospheric Administration announced this week that last month's average global temperature was 61.2 degrees, which is 1.3 degrees higher than the 20th century average. It beat 2010's old record by one-twentieth of a degree.
As local and national governments struggle to deal with ever-growing piles of electronic waste (e-waste), scientists are now refining the picture of just how much there is and where it really ends up. Published in Environmental Science & Technology, their study found that nearly a quarter of e-waste that developed countries discard floods into just seven developing countries.
According to recent research from McGill Univ., statistical analysis of average global temperatures between 1998 and 2013 shows that the slowdown in global warming during this period is consistent with natural variations in temperature. The study concludes that a natural cooling fluctuation during this period largely masked the warming effects of a continued increase in man-made emissions of carbon dioxide and other greenhouse gases.
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