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Science & Technology


17 Apr 2015: New Mapping Tool Could
Lower Cost of Finding Geothermal Energy

A new online mapping tool could help governments and investors evaluate the geothermal energy potential for locations around

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geothermal map

Geothermal mapping tool
the globe through satellite measurements, lowering the risks and costs involved in developing this clean energy source, its creators say. The tool uses gravity measurements from European Space Agency (ESA) satellites to look for certain characteristics unique to geothermal reservoirs, including areas with thin crusts, subduction zones, and young magmatic activity. This helps determine which locations are most likely to possess geothermal energy potential, narrowing the search — and cost — for prospectors. The project, which is a partnership between the ESA and the International Renewable Energy Agency (IRENA), will "help make a strong business case for geothermal development where none existed before,” said a director at IRENA.
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16 Apr 2015: Researchers Discover New
Source of Methane in the Arctic Ocean

A large reservoir of methane — a greenhouse gas many times more potent than carbon dioxide — was recently discovered on

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Knipovich Ridge in Arctic Ocean

Knipovich Ridge in the Arctic Ocean
Knipovich Ridge in the central Arctic Ocean, according to research published in the journal Geology. The methane in this deposit is locked up in icy crystals of water and gas called hydrates, and it was produced by abiotic geological processes rather than by microbes breaking down organic matter, as most methane is, the authors explain. Until now, scientists had not known that hydrates could contain this type of methane. "Up to 15,000 gigatons of carbon may be stored in the form of hydrates in the ocean floor, but this estimate is not accounting for abiotic methane," said co-author Jürgen Mienert. "So there is probably much more."
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15 Apr 2015: Entries Invited for e360
Contest For Best Environmental Videos

The second annual Yale Environment 360 Video Contest is now accepting entries. The contest honors the best environmental videos. Entries must be videos that focus on an environmental issue or theme, have not been widely viewed online, and are a maximum of 15 minutes in length. Videos that are funded by an organization or company and are primarily about that organization or company are not eligible. The first-place winner will receive $2,000, two runners-up will each receive $500, and all winning entries will be posted on Yale Environment 360. The contest judges will be Yale Environment 360 editor Roger Cohn, New Yorker writer and e360 contributor Elizabeth Kolbert, and documentary filmmaker Thomas Lennon. The deadline for entries is June 15, 2015.
Read more.
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08 Apr 2015: Clay Shows Promise in
Capturing CO2 from Power Plants

Common clay can be just as effective as more advanced materials in capturing carbon dioxide emissions from power plants, according to research by Norwegian and Slovak scientists. One particular type of clay mineral, known as smectite, was especially effective in absorbing CO2 emissions, the researchers said in the journal Scientific Reports. One possible use for clay would be to incorporate it into filters or scrubbers in smokestacks at power plants, the scientists said. They said their research into clay’s CO2-absorbing capabilities is preliminary and would not be available for commercial use anytime soon. But the scientists said clay offers many benefits compared to some other expensive and potentially toxic CO2-scrubbing materials.
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27 Mar 2015: Metals Used in High Tech
Are Becoming Harder to Find, Study Says

Metals critical to newer technologies such as smartphones, infrared optics, and medical imaging will likely become harder

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metal criticality

This chart shows the criticality of 62 metals.
to obtain in coming decades, according to Yale researchers, and future products need to be designed to make reclaiming and recycling those materials easier. The study, the first to assess future supply risks to all 62 metals on the periodic table, found that many of the metals traditionally used in manufacturing — zinc, copper, aluminum, lead, and others — show no signs of vulnerability. But some metals that have become more common in technology over the last two decades, such as rare earth metals, are available almost entirely as byproducts, the researchers say. "You can't mine specifically for them; they often exist in small quantities and are used for specialty purposes," said Yale scientist Thomas Graedel. "And they don't have any decent substitutes."
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25 Mar 2015: Dutch Energy Company Heats
Homes With Custom-Built Computer Servers

A Dutch energy company is installing radiator-sized computer servers — which infamously generate large amounts of
Nerdalize radiator server

A radiator-sized computer server installed in a home.
waste heat as they churn out data — in residential homes to offset energy costs, company representatives said this week. In the trial program, Rotterdam-based Eneco has equipped a handful of houses with custom-built computer servers designed to heat rooms as the servers process data for a variety of corporate computing clients. Eneco and the company behind the radiator-servers, Nerdalize, expect each one to reduce a home's heating expenses by roughly $440 over the course of a year. Eneco will cover all computing-related energy costs, the company said, but they expect the program to reduce server maintenance costs by up to 55 percent through preventing complications that arise when servers overheat. In summer months, the server-radiators will redirect excess heat outside the home, its designers say.
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16 Mar 2015: El Niño and La Niña Can Predict
Severity of Tornado Season, Study Says

El Niño and La Niña conditions can help predict the frequency of tornadoes and hail storms in some of the most
tornado

Tornado near El Reno, Okla., in May 2013.
susceptible regions of the U.S., new research published in the journal Nature Geoscience shows. Scientists have been using El Niño and La Niña conditions, which can be identified months before the climate cycles actually develop, to make more accurate forecasts of droughts, flooding, and hurricane activity. Now, a team of researchers says they can also forecast how active the spring tornado season will be based on the state of El Niño or La Niña in December, and sometimes even earlier. Moderately strong La Niña events lead to more tornadoes and hail storms over portions of Oklahoma, Texas, Kansas, and other parts of the southern U.S., the study shows, whereas El Niño patterns suppress the storms. Scientists have detected El Niño conditions over the past few weeks, which indicates that this spring will be a relatively quiet one for severe storms in the southern U.S., the authors say.
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11 Mar 2015: Warming To Sharply Increase
For Remainder of 21st Century, Paper Says

Within a decade, the earth — and particularly the northern hemisphere — will begin warming at rates unprecedented in the last 1,000 to 2,000 years, according to new research in the journal Nature Climate Change. Examining the rate of temperature increases in 40-year intervals over the past 2,000 years, the scientists concluded that temperatures had fluctuated up or down by about 0.2 degrees F over each interval. In the past 40 years, however, warming has approached 0.4 degrees F per decade. And beginning in 2020, temperatures could start to rise by 0.7 degrees F per decade and continue at that rate until at least 2100. Warming will be especially pronounced in the Arctic, where temperatures are expected to soar by 1.1 degrees F by 2040. The scientists warned that such greenhouse gas-driven warming is moving the planet into an unstable climatic state.
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03 Mar 2015: Photographs of Amazon Forest
Added to Google Street View Collection

Detailed views of the Amazon rainforest, its rivers, and indigenous communities are the latest additions to Google's

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Boaters on Rio Negro

Boaters on the Rio Negro
"Street View" collection, the company announced this week. The imagery — captured while boating down 500 kilometers of rivers, walking along 20 kilometers of trails, and ziplining through dense forest — reveals stunning views of the Amazon from the top of its canopy to the forest floor. The photos also capture daily life in 17 communities of local people who live deep within the rainforest and along the Rio Mariepauá, one of the Amazon River's largest tributaries. The images were collected in partnership with the conservation organization Amazonas Sustainable Foundation, which hopes that sharing in-depth photographs of the area will help promote conservation efforts.
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Interview: How Climate Change
Helped Lead to Conflict in Syria

Before Syria devolved into civil war, that country experienced its worst drought on record. The consequences of this disaster
Colin Kelley
Colin Kelley
included massive crop failures, rising food prices, and a mass migration to urban areas. In a new study in the Proceedings of the National Academy of Sciences, researchers suggest the drought and its ensuing chaos helped spark the Syrian uprising. They make the case that climate change was responsible for the severity of the drought. Colin Kelley, a climatologist at the University of California, Santa Barbara, was the study’s lead author. In an interview with Yale Environment 360, Kelley explains that long-term precipitation and soil temperature trends in Syria and the rest of the region correlate well with climate change models, demonstrating, he says, that the record-setting drought can’t be attributed to natural variability.
Read the interview.
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26 Feb 2015: Heat-Trapping Effects of
CO2 Measured in Nature for First Time

Scientists have long understood how carbon dioxide traps heat in the atmosphere and contributes to global warming, but the phenomenon had not been directly documented at the earth's surface outside of a laboratory — until now. Writing in the journal Nature, researchers present 11 years of field data on carbon dioxide's capacity to absorb thermal radiation emitted from the surface of the earth. The results agree with theoretical predictions of the greenhouse effect associated with fossil fuel combustion, researchers say, and provide further confirmation that calculations used in climate models are on track when it comes to representing the impact of CO2 emissions. "We see, for the first time in the field, the amplification of the greenhouse effect because there's more CO2 in the atmosphere to absorb what the earth emits in response to incoming solar radiation," says Daniel Feldman, a scientist at Berkeley Lab and lead author of the study.
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23 Feb 2015: Large-scale Pumping Can
Return Oxygen To Deep Waters, Study Finds

A team of Danish and Swedish scientists reports that they have restored oxygen to the waters
wind plant locations in Texas

Deploying instruments in Byfjord, Sweden.
of a deep fjord that had suffered from a long-term lack of oxygen. The researchers used large pumps to mix oxygen-rich surface water into the deeper parts of the fjord's water column — which had long been anoxic due to its depth and geological setting — and after only two months higher oxygen concentrations became detectable in the bottom waters. "In the later phase of the experiment the entire water column began to look healthy," the researchers said, noting that bacterial species that live in well-oxygenated waters had begun to appear. Low oxygen levels make waters uninhabitable to most forms of life, and anoxic waters often harbor only a few types of bacteria, some of which produce significant levels of greenhouse gases.
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16 Feb 2015: Space-Based Measurments Can
Track Global Ocean Acidity, Researchers Say

An international team of scientists has developed new methods for studying the acidity of the oceans from space,

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ocean acidification map

Global ocean alkalinity measured from space.
according to research published in the journal Environmental Science and Technology. Currently, scientists must rely on measurements taken from research vessels and sampling equipment deployed in oceans to determine acidity — which rises as the oceans absorb CO2 from the atmosphere — but this approach is expensive and geographically limited. The new techniques use satellite-mounted thermal cameras to measure ocean temperature and microwave sensors to measure salinity. Together these measurements can be used to assess ocean acidification more quickly and over much larger areas than has been possible before.
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12 Feb 2015: Mange in Yellowstone Wolves
Documented Through Thermal Images

Researchers with the U.S. Geological Survey are using thermal video cameras to study how mange is affecting
wolf with mange

Thermal image of a wolf with mange on its legs.
wolves in Yellowstone National Park, as shown in this video. Mange is a highly contagious skin disease caused by mites that burrow into the skin of dogs and wolves, causing infections, hair loss, irritation, and intense itching. The urge to scratch can be so overwhelming that the wolves neglect resting and hunting, researchers say, leaving them vulnerable to hypothermia, malnutrition, and dehydration, which can eventually lead to death. Thermal imagery allows scientists to document the extent of hair loss and the actual loss of heat associated with different stages of infection. Red patches on a wolf's legs, as shown in this image, indicate rapid heat loss caused by mange.
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11 Feb 2015: Learning About Geoengineering
Spurs More Agreement on Climate, Study Says

Geoengineering, an experimental series of technologies aimed at counteracting the effects of climate change, could potentially diminish political polarization over global warming, according to new research. Roughly 3,000 participants in a study displayed more open-mindedness toward evidence of climate change and more agreement on the significance of such evidence after learning about geoengineering technologies, according to a study conducted by researchers at Yale and other universities. Participants became more polarized when they were told that curbing climate change would require reducing greenhouse gas emissions, the researchers report. The findings come after a report this week from the U.S. National Research Council recommended limited government-sponsored research into the use of sulfate aerosols, a potential geoengineering strategy known as albedo modification.
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06 Feb 2015: Maine’s Iconic Lobsters
Face Threats From Ocean Acidification

Maine’s lobster fishery, worth $1.7 billion to the state and a vital source of employment, could be

A Maine lobster
threatened by acidifying ocean waters and rising sea temperatures, according to a new report. The report, issued by a state commission, called increasingly acidic ocean waters — caused by the absorption of CO2 from the atmosphere — an “urgent matter” that needs to be addressed by state and local governments and the fishing infustry. Facing the prospect that increasing acidity could interfere with the ability of lobsters to make their shells, the commission set forth a handful of goals, including a stepped-up research effort on the acidification of the coast’s waters and its impact on crustaceans. Maine lawmakers have already introduced legislation for limits on industrial and agricultural runoff, which contribute to coastal water acidification.
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05 Feb 2015: Ultra-Efficient Solar Cells
Can Be Adapted for Rooftops, Research Finds

Extremely efficient solar cells similar to those used in space may soon be ready for installation on residential rooftops, according to a report in Nature Communications. Concentrated photovoltaic (CPV) systems, which use lenses and curved mirrors to focus sunlight onto small solar cells, produce energy much more efficiently than conventional solar panels — 40-percent efficiency compared to less than 20 percent for standard silicon systems. But they are typically the size of billboards and have to be positioned very accurately to track the sun throughout the day. Now researchers have overcome these obstacles by developing a CPV system that uses miniaturized gallium-arsenide photovoltaic cells, 3D-printed plastic lens arrays, and a moveable focusing mechanism. The new system is small and light enough to fit on a residential rooftop and should be inexpensive to produce, researchers say.
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04 Feb 2015: Plant-Like Sea Slug Can Steal
Genes From its Food, Researchers Report

The emerald green, leaf-shaped sea slug known as Elysia chlorotica can live for months at a time by

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sea slug Elysia chlorotica

Sea slug Elysia chlorotica
photosynthesizing its own food, like a plant does, but until recently scientists did not understand how the slug acquired and maintained this rare ability. A recent report in the journal The Biological Bulletin shows that the slug steals genes and chloroplasts — the cellular machinery that converts sunlight into food — from algae that the slug eats. Genes lifted from the algae can maintain cholorplasts in the slug for up to nine months, the researchers say — much longer than the chloroplasts would last in the algae themselves. Moreover, the slug can pass on those stolen genes to its offspring. The process is a mechanism of rapid evolution, says one of the study's authors.
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02 Feb 2015: Many California Farms and
Orchards Idled By Drought, NASA Maps Show

In 2014 — the driest year ever recorded in California — farms and orchards in the state's Central Valley took a major hit

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California agriculture status

Status of CA farms in 2011 (left) and 2014 (right).
and many agricultural plots were left fallow, as shown in these maps based on NASA satellite data. The maps depict the status of crop cultivation in California in August 2011 and August 2014. Brown pixels show farms and orchards that have been left fallow, or “idled,” since January 1 in each year. Green pixels show plots where at least one crop was grown during the year. The most recent year with average or above average precipitation across the state was 2011, and, as the map shows, relatively little agricultural land was left fallow that year. In 2014, a much higher proportion of farms and orchards were idle.
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15 Jan 2015: Underwater Kelp Forests Mapped
In New Citizen Science Project

Kelp forests grow along roughly 25 percent of the world’s coastlines and provide valuable habitat and nutrients for many types of aquatic life. Now, research by the “Floating Forests” project is shedding light on how these underwater kelp forests are affected by climate change. The project is using NASA satellite data to observe changes in kelp forests over a period of more than four decades. The catch: No accurate way to automate the process exists, so the researchers rely on an international team of nearly 3,500 citizen scientists to mark the bright green kelp forests, which contrast with the deep blues of the ocean in the images.
Read more.
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06 Jan 2015: Penguin Watch Projects Asks
Citizen Scientists to Monitor Birds' Habits

Penguin Watch, a citizen science project launched by researchers from the University of Oxford in the U.K., is enlisting the

Group of Gentoo penguins
public's help in counting penguins in some 175,000 photos from locations across the Southern Hemisphere. Researchers are monitoring five penguin species — Gentoo, Chinstrap, Adelie, Rockhopper, and King penguins — and recording information on the number of adults, chicks, and eggs, as well as their winter behavior, breeding success, and travel habits. The project is especially useful for monitoring penguins' winter behavior, for example, because it's logistically difficult for the researchers to visit these locations in winter, they say, and the images are far too numerous for researchers to view on their own. Understanding how the penguins live day-to-day should help shed light on how the penguins will respond to an increasingly volatile climate, the team says.
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05 Jan 2015: U.S. Cities Are Significantly
Brighter than German Cities, Scientists Say

German cities emit several times less light per capita than similarly sized American cities, according to new research published in the journal Remote Sensing.

Berlin, Germany, at night
Moreover, the differences in light emission become more dramatic as city size increases: Light per capita increases with city size in the U.S. but decreases in Germany. Factors such as the type of lamps used and architectural elements like the width of the streets and the amount of trees are likely behind the differences, the researchers say. Energy-efficient LED street lighting is currently being installed in many cities worldwide, and the researchers expect this to change the nighttime environment in many ways — for example, by reducing the amount of light that shines upward. The study also found that, in major cities in developing countries, the brightest light sources were typically airports or harbors, whereas the brightest areas in large European cities are often stadiums and city centers.
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02 Jan 2015: Historical Photos Help
Document Changes in Greenland Glaciers

Historical photographs from the early and mid-1900s have helped researchers from Denmark map the retreat

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Photo of a Greenland glacier from 1935
of Greenland's glaciers, according to findings presented recently at the American Geophysical Union meeting. This glacier near the Sukkertoppen ice cap in southwest Greenland, for example, retreated roughly two miles between 1935 and 2013, as shown in photographs from the Danish Geodata Agency and the Natural History Museum of Denmark. Older photographs, from 1900 to 1930, show even more remarkable changes. During that time, following the end of the Little Ice Age in the late-19th century, glaciers retreated more rapidly than they have been in recent years, the researchers say. They believe the findings will shed light on how quickly these glaciers might react to future temperature changes.
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23 Dec 2014: Madrid Announces Largest
Energy-Efficient Street Lighting Project

The city of Madrid has announced plans to renew its entire street lighting system with 225,000 new energy-efficient

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Madrid announces energy efficient street lighting project

New energy-efficient street lighting in Madrid, Spain.
bulbs, the world’s largest street-lighting upgrade to date. The new lights, which will afford the city a 44-percent reduction in energy costs, will pay for themselves, according to Philips, the company supplying the new system. In addition to drawing less overall power, the bulbs’ intensity will be controlled from a central command panel, resulting in less wasted energy. Of the 225,000 new lights, 84,000 will be locally manufactured LEDs, and the city is taking measures to ensure the safe recycling of heavy metals found in the old lamps. Similar, though smaller, projects have been undertaken in Argentina, Sweden, and the Netherlands. 

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26 Nov 2014: Aerodynamic Upgrades to
Large Trucks Would Cut Fuel Use Steeply

The fuel consumption of the 2 million tractor-trailer trucks hauling cargo across the U.S. — which currently

Airflow patterns around a tractor-trailer truck
burn 36 billion gallons of diesel fuel per year — could be cut by billions of gallons through the use of drag-reducing devices, according to researchers at Lawrence Livermore National Laboratory. In wind tunnel tests, researchers fitted a scale-model truck with two types of devices designed to reduce drag and improve aerodynamics: a trailer skirt, which consists of panels affixed along the lower side edges of a trailer, and a boat tail fairing, which is affixed to the back of the trailer to reduce the size of its wake. The researchers found that using the devices in combination — technology currently installed on only 3 to 4 percent of the nation’s large trucks — reduced the aerodynamic drag by as much as 25 percent, which translates to a 13-percent decrease in fuel consumption. If the U.S. tractor-trailer fleet were to improve its fuel economy by 19 percent, which the researchers say is achievable, 6.5 billion gallons of diesel fuel would be saved each year, avoiding 66 million tons of carbon dioxide emissions.
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18 Nov 2014: Social Media Can Help Track Severity of Air Pollution, Researchers Say

Social media posts can help researchers estimate air pollution levels with significant accuracy, according to a team of computer scientists from the University of Wisconsin. The researchers analyzed posts on Weibo — a Twitter-like site that is China's most popular social media outlet — from 108 Chinese cities over 30 days, tracking how often people complained about the air and the words they used to describe air quality. The study showed that the process can provide accurate, real-time information on the air quality index, a widely used measure of common air pollutants. Large Chinese cities sometimes have physical monitoring stations to gauge pollution levels, but smaller cities generally do not because monitors are expensive to install and maintain. The researchers hope these findings will help residents of smaller towns and less affluent areas understand the severity of their local air pollution. Between 350,000 and 500,000 Chinese citizens die prematurely each year because of air pollution, a former Chinese health minister estimated in the journal The Lancet.
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14 Nov 2014: New Material Can Trap Powerful Greenhouse Gases Efficiently, Chemists Say

Scientists from the U.S. and Taiwan have developed a new type of lightweight, self-assembling molecule that can capture large amounts of potent greenhouse gases,

This porous material traps greenhouse gases.
according to a report in Nature Communications. The molecules create a lightweight structure with many microscopic pores that can adsorb gases such as chlorofluorocarbons (CFCs). Those long-lived compounds, once widely used as refrigerants, were phased out because they damage the ozone layer, but they are still used in various industrial processes. The newly developed material is rich in the element fluorine, which helps it bind CFCs and various other hydro- and fluorocarbon gases very efficiently — to the tune of 75 percent by weight, the chemists say. Although they are less prevalent, the greenhouse effect of those gases can be hundreds- or thousands-fold more powerful than carbon dioxide, the researchers note. Heavier, metal-based materials with similar capabilities have been developed in previous studies, but these were sensitive to water and difficult to process and recycle.
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13 Nov 2014: Global Maps Detail Seasonal and Geographic Trends in Ocean Acidification

A team of scientists has published the most comprehensive analysis yet of how acidity levels vary across the world’s oceans. Drawing on four decades of

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Taro Takahashi
Ocean acidification map
measurements, researchers from Columbia University and the University of Colorado mapped changes in ocean acidity by season and location, as well as how acidity levels affect the stability of shell-building minerals. The maps reveal that the northern Indian Ocean is at least 10 percent more acidic than the Atlantic and Pacific oceans, possibly due to its unique geography, the researchers say. The maps also show that ocean acidity fluctuates most in the colder waters off Siberia, Alaska, Antarctica, and the Pacific Northwest, due to cycles of deep-water upwelling and massive plankton blooms. The oceans have taken up a quarter of the carbon dioxide humans have put in the atmosphere over the last two hundred years, and acid levels at the surface have increased by 30 percent since the beginning of the industrial era, researchers say.
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06 Nov 2014: Scientists Call For Greater Diversity of Viewpoints on Conservation

In a call to arms published this week in the journal Nature, a group of more than 200 environmental scientists, academics and others involved in the fields of conservation research, policy and advocacy, condemned what they called a lack of diversity within their ranks and the philosophical polarization they say it has engendered. Spearheaded by Heather Tallis, lead scientist at the Nature Conservancy, and Jane Lubchenco, a professor of marine biology at Oregon State University and former head of the National Oceanic and Atmospheric Administration, the commentary argues that a once-spirited but constructive debate between two conservation philosophies — one viewing nature as intrinsically valuable, the other connecting its value with its utility — was now mired in vitriol and acrimony. "We believe that this situation is stifling productive discourse, inhibiting funding and halting progress," the authors wrote, adding that the situation was being made worse because the "dispute has become dominated by only a few voices, nearly all of them men’s."
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03 Nov 2014: Climate Impacts To Be Severe and Irreversible Without Emission Cuts, UN Says

Climate change will have “severe, widespread, and irreversible impacts” on society and the environment

The U.N. climate panel's synthesis report was released on November 2.
unless nations swiftly and drastically cut carbon emissions — a goal that, while difficult, still remains within reach, according to a comprehensive new United Nations climate report released this week. Failure to curb emissions by the end of the century will likely lead to food shortages, refugee crises, the flooding of major coastal cities and entire island nations, and dangerous yet routine heat waves, among other impacts, the analysis concluded. But the panel also said for the first time that combating climate change is economically feasible. The new U.N. report synthesizes the findings from a series of analyses released over the past year by the Intergovernmental Panel on Climate Change — the panel's first major update since 2007.
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