07 Apr 2014:
Newfound Atmospheric 'Hole'
Threatens Polar Ozone Layer, Scientists Say
Researchers have discovered
a large opening in the Earth's atmosphere that is enabling pollutants to rise
Pacific atmosphere hole an elevator to the stratosphere
into the stratosphere and destroy ozone. The hole, which is in a part of the lower atmosphere called the "OH shield," is several thousand kilometers long and is centered over the tropical west Pacific Ocean. It's relatively close to Southeast Asia, a region with a booming population and rapidly increasing air pollution. The hole is a major concern because the OH shield usually scrubs air of chemical compounds emitted near the ground before they can reach the stratosphere, where those compounds can persist for long periods of time, reacting with and destroying ozone, say researchers at Germany's Alfred Wegener Institute who identified the hole. The newly discovered phenomenon acts as a sort of elevator, researchers say, drawing chlorofluorocarbons, sulfur dioxide, and other contaminants straight up to the stratosphere and bypassing the OH shield scrub.
E360 Announces Contest
Yale Environment 360
For Best Environmental Videos
is holding a contest to honor 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. The first-place winner will receive $2,000, and two runners-up will each receive $500. The winning entries will be posted on Yale Environment 360
. The deadline for entries is June 6, 2014. Read further contest information.
04 Apr 2014:
Solar Panels Could Beam Power
From Space Down to Earth, U.S. Navy Says
Researchers from the U.S. military are developing technology that would harvest solar energy in space and beam it down to Earth, according to
the Naval Research Laboratory. Although the concept seems futuristic, the
Navy is currently testing two prototype designs, both of which combine solar panels with electronic components that convert the energy to radio waves and transmit it to Earth. Eventually, engineers plan to use robotic vehicles to transport the panels to space and assemble them into a 1-kilometer wide satellite orbiting the planet. Theoretically, harvesting solar energy in space is more efficient than on Earth, because panels can collect sunlight around the clock and regardless of weather conditions. The U.S. military, currently the world's largest oil consumer, is eager to develop the technology to save money on fuel and simplify military deployments. But the private sector also has plans for the technology: California utility company Pacific Gas & Electric plans to buy space solar power by 2016.
03 Apr 2014:
Deforestation of Sandy Soils
Increases the Release of CO2, Study Finds
The texture of the soil that microbes live in determines how much carbon they release after deforestation, with sandy soils sending the most carbon into the atmosphere, according to research
led by Yale scientists.
Soils most affected by forest loss in red; least in yellow.
Subterranean microbes regulate carbon emissions from soil, and drastic changes to the microbial community, such as those that follow deforestation, can allow more CO2 to escape into the atmosphere and exacerbate global warming. The texture of soil, rather than such factors as temperature or nutrient concentrations, was the most important factor governing the release of CO2, the researchers found. Muddy, clay-like soils provide the most stable environment for microbial communities, likely because they're better at retaining nutrients than loose, sandy soils. The team used the findings to map areas in the U.S. where soil microbial communities would be most and least affected by deforestation, which could help inform land management practices.
Comment: e360 Point/Counterpoint Debate
On University Fossil Fuel Divestment
Scientists Charles H. Greene, of Cornell University, and Daniel M. Kammen, of the University of California, Berkeley, offer commentary on the recent Yale Environment 360 Point
articles on the
Student protest at Tufts University last spring
issue of whether universities should take a stand against climate change by divesting from companies that produce oil, natural gas, or coal. Greene and Kammen make the case that the movement to divest is gaining ground on U.S. campuses and will eventually succeed because fossil fuels are increasingly seen as a potentially risky investment. "We predict that divestment at the nation’s colleges and universities will occur much more rapidly than anybody imagined at the start of the campaign just over a year ago," they write. Read their comment.
01 Apr 2014:
Delaware River Watershed
Is Focus Of Large-Scale Restoration Project
A Philadelphia foundation is providing $35 million to launch a host of programs aimed at better protecting the Delaware River
, which flows through the heart of
Delaware River at Trenton, New Jersey
the populous U.S. eastern seaboard and provides drinking water for 15 million people. The William Penn Foundation, working with nonprofit groups such as The Open Space Institute, says its Delaware River Initiative will protect more than 30,000 acres of land, launch 40 restoration projects, create incentives for businesses and landowners to protect the watershed, and set up a comprehensive program of water quality monitoring that will enable the foundation and its partners to measure the success of their programs and the overall health of the river. A cornerstone of the foundation’s initiative will be its restoration and protection work in eight so-called “sub-watersheds” that feed into the Delaware River.
31 Mar 2014:
IPCC Issues Stark Report
On Present and Future Climate Impacts
Rapidly rising levels of greenhouse gases are already having a major impact on the earth’s natural systems and the problem is likely to grow significantly worse
unless these emissions are brought under control, according to a new report by the Intergovernmental Panel on Climate Change (IPCC). The report
, released in Yokohama, Japan, said that steadily rising temperatures are melting polar ice caps, sharply diminishing Arctic sea ice, intensifying heat waves and heavy rains, causing the death of coral reefs, and placing water and food supplies under stress. The report on climate impacts, drafted by several hundred of the world’s leading climate scientists, emphasized that the world’s food supply is at considerable risk. Already, the report said, heat waves and water stress are affecting the output of wheat and corn on a global scale, impacts that are only expected to intensify in the future, further exacerbating food shortages. “Nobody on this planet is going to be untouched by the impacts of climate change,” said IPCC chairman Rajendra K. Pachauri.
28 Mar 2014:
West Antarctic Glacial Loss
Is Rapidly Intensifying, New Study Shows
Six massive glaciers in West Antarctica are dumping far more ice into the Southern Ocean than they were 40
An 18-mile crack in the Pine Island Glacier
years ago and now account for 10 percent of the world’s sea level rise
, according to a new study. Reporting in Geophysical Research Letters
, an international team of scientists said that the amount of ice draining from the six glaciers has increased by 77 percent since 1973. The scientists said that the ice loss from the six glaciers is so substantial that it equals the amount of ice draining annually from the entire Greenland Ice Sheet. The scientists used satellite data from 1973 and 2013 to gauge the ice loss from the six glaciers. The Pine Island Glacier
is moving more rapidly to the sea than any of the other six, with its speed increasing from 1.5 miles per year in 1973 to 2.5 miles per year in 2013. The glaciers are dumping more ice into the sea primarily because warmer ocean waters are loosening the ice sheets’ hold on the sea floor, which speeds up glacial flow.
27 Mar 2014:
Wind Turbine in a Blimp
Can Bring Power to Remote Locations
A Massachusetts company will soon deploy a portable wind energy system using a conventional turbine blade inside a cylindrical blimp that floats about 1,000 feet above the ground
, drawing on the stronger winds at
. The Buoyant Airborne Turbine (BAT), developed by Altaeros
, is designed to be used in off-the-grid locations where importing diesel fuel or other energy is expensive. The company recently announced a $1.3 million demonstration project in Alaska that will supply power to about a dozen homes. Altaeros says it is also working on deals to install projects in remote locations in Canada and Australia. The BAT, made of industrial fabric, sends power back via high-strength tethers that hold it to the ground. Altaeros is one of several companies developing wind turbines that hover above the earth or fly, including Makani
, which has invented a turbine that looks like a flying wing. Makani was acquired last year by Google X.
26 Mar 2014:
New Satellite Tracks Global
Precipitation in Unprecedented Detail
Launched into space late last month, a new Earth-observing satellite from NASA and the Japan space agency has captured its first images
, which show an
extra-tropical cyclone off the coast of Japan at unprecedented resolution. The satellite, called the Global Precipitation Measurement (GPM) Core Observatory, combines two powerful instruments that allow scientists to monitor precipitation around the globe in great detail, as the cyclone image demonstrates. One instrument, the Dual-frequency Precipitation Radar, captured a three-dimensional cross-section of the storm, with the heaviest precipitation shown in red and yellow. The second tool, a GPM Microwave Imager, observed different types of precipitation across a broad swath of the storm. Together, the instruments will help scientists more accurately predict rainfall and calculate how much precipitation falls to the Earth's surface.
25 Mar 2014:
Consumer Products Giants
Commit to Deforestation-Free Palm Oil
Two major consumer products companies — General Mills and Colgate-Palmolive — have committed
to using palm oil in their products that does not come from lands cleared from tropical forests, adding to the wave
of corporations that have pledged measures to protect southeast Asian rainforests. The consumer giants' new policies go beyond standards set by the industry's main certification body and include provisions to protect wildlife-rich rainforests, carbon-dense peatlands, and the rights of local communities. Environmental groups are welcoming the commitments, though some believe the companies' pledges should go further. The Union of Concerned Scientists questions General Mills' definition of "high carbon stock" forests, while Greenpeace is urging Colgate-Palmolive to move implementation up to 2015 from 2020. Environmental groups are hopeful that new commitments will pressure Proctor & Gamble, the last remaining consumer products giant without a similar pledge, to adopt deforestation-free palm oil policies.
Five Questions for Mario Molina
On Climate Science’s PR Campaign
The American Association for the Advancement of Science (AAAS), the world’s largest scientific society,
recently launched the “What We Know”
campaign, designed to cut through the fog of misinformation about climate change and convey to the public the current state of climate science. Chairing that effort is Mario J. Molina, a chemist who won a 1995 Nobel Prize for his work on the threat to the world’s ozone layer. Yale Environment 360
asked Molina five questions about the AAAS campaign and why it might succeed where previous efforts have failed.
24 Mar 2014:
Ride-Sharing Could Cut Taxi
Trips by 40 Percent in NYC, Analysis Shows
New interactive maps from MIT analyze the potential environmental and economic savings of ride-sharing in dense urban areas — in particular, the benefits of sharing taxicabs in New York City. The project, called
, uses data from 170 million trips made by New York City's 13,500 taxis in 2011. High-resolution GPS coordinates and timestamps for each trip allowed researchers to pinpoint locations in the city that are high-traffic hubs for taxi pick-ups and drop-offs, as well as calculate fare savings, decreases in total miles traveled, and cuts in CO2 emissions if ride-sharing existed. The researchers found that taxi-sharing could reduce the number of trips by 40 percent with only minimal inconvenience to the passengers. The findings highlight the potential benefits of ride-sharing in New York and other cities, including lower vehicle emissions, reduced congestion, and savings in time and money.
21 Mar 2014:
Koch Brothers Biggest Lease
Holders in Alberta Tar Sands, Report Finds
The largest lease holder in Canada's oil sands is a subsidiary of Koch Industries
, the conglomerate that is the source of the fortune owned by the controversial conservative political donors, Charles and David Koch. The Koch's holdings in the tar sands were disclosed by an activist group
that analyzed mineral records of the Alberta government. The Koch subsidiary holds leases on at least 1.1 million acres in the northern Alberta oil sands, which span roughly 35 million acres; other industry experts estimate the total Koch holdings could be closer to 2 million acres. That puts Koch Industries ahead of energy heavyweights Royal Dutch Shell and Conoco Phillips, both of which lease significant acreage in the oil sands. The findings are likely to inflame the debate surrounding the proposed Keystone XL pipeline — which would transport tar sands oil to refineries in Texas — although the Koch's company has not reserved space in the pipeline. Activists argue that the Kochs do have a stake in the outcome of the Keystone XL battle because the pipeline would drive down crude oil transportation costs, benefiting all lease holders.
20 Mar 2014:
The 2013-2014 Winter Was
The 34th Coldest on Record in U.S., NASA Says
Although many residents of eastern North America may feel like they’ve just suffered through a winter of record cold, the fact is that the winter of 2013-2014 was only
the 34th coldest in 119 years of record keeping in the U.S. As this map
from the U.S. National Climatic Data Center shows, temperatures in the eastern and southern U.S. from Dec. 1, 2013, to Feb. 28th, 2014, were as much as 8 degrees C (14 F) colder than the 2000 to 2013 average for those months. But the western U.S. and Alaska saw unusually warm weather, with California experiencing its hottest winter on record. Overall, temperatures this past winter in the U.S. were about 1 degree F above average. Meanwhile, temperatures in Russia, Asia, and much of Europe were well above average this winter, and land temperatures globally for December, January, and February were the 10th warmest on record.
19 Mar 2014:
CO2 Levels Have Crossed
400 ppm Threshold Far Earlier This Year
Concentrations of carbon dioxide in the atmosphere have reached the 400 parts per million threshold two months earlier this year than last, an indication that the planet will soon experience the 400 ppm level year-round, according to
scientists from the Scripps Institute of Oceanography. Last year was the first time in hundreds of thousands of years that the 400 ppm threshold was crossed. Scripps scientists expect
CO2 levels to hover around 400 ppm for the next two months, when the Northern Hemisphere spring will go into full bloom and plants will suck CO2 from the atmosphere until going dormant in the fall. "It’s just a matter of time before it stays over 400 forever," said Ralph Keeling, who took over the CO2 monitoring program from his father, Charles David Keeling, who started it in 1958. Since then, atmospheric CO2 levels have risen steadily from 313 ppm as the world continues to burn fossil fuels. Scientists estimate it's been 800,000 to 15 million years since the planet has seen concentrations this high.
18 Mar 2014:
Wildflower Season in Rockies
Is 35 Days Longer as Climate Warms
A warming climate has extended the wildflower season in the Rocky Mountains by 35 days since the 1970s,
according to a 39-year study of more than two million blooms. The bloom season, which used to run from late May to early September, now lasts from late April to late
Crested Butte, Colorado
September, the researchers say. Previous, less extensive studies seemed to indicate most wildflowers simply shift their bloom cycles to earlier in the year, but new findings
published in the Proceedings of the National Academy of Sciences
show that the changes are more complex, with the flowers reaching peak bloom sooner and flowering later in the year. The shift in the timing of blooms could have a major impact on pollinating insects and migratory birds. For example, hummingbirds that summer in the Rocky Mountains time their nesting so that their eggs hatch at peak bloom, when there is plenty of flower nectar for hungry chicks. As the bloom season lengthens, the plants are not producing more flowers. The same number of blooms is spread out over more days, so at peak bloom there may be fewer flowers and less food for hummingbirds, the researchers say.
17 Mar 2014:
Northeast Greenland Glaciers
Are Now Melting Rapidly, Study Finds
The glaciers of northeast Greenland, long thought to be the most stable part of the massive Greenland ice sheet, are melting at an accelerating pace, losing roughly 10
billion tons of ice annually for the past decade, say researchers
from the U.S. and Denmark. The finding will likely boost estimates of global sea level rise, which had previously not accounted for massive ice loss from that region, scientists say. The Zachariae ice stream in northeast Greenland, which drains 16 percent of the ice sheet, has retreated roughly 12.4 miles in the past decade, outpacing the fast-moving Jakobshavn glacier, which has retreated 21.7 miles over the last 150 years. Ice loss from the region is likely accelerating, the researchers say, because ice dams in nearby bays that had been blocking the glaciers' paths are now also melting, freeing the way for the glaciers to flow into the ocean.
14 Mar 2014:
Major Winds Have Lashed
North Atlantic This Winter, NOAA Map Shows
Forty-three hurricane-force winter storms have lashed the North Atlantic since late October, boosting the region's average wind speed in January and February by more than 12 miles per hour, as shown in this map
the U.S. National Oceanic and Atmospheric Administration (NOAA). The blue colors indicate areas where wind speeds exceeded the 1981-2010 average; browns indicate winds that were lower than average. In the North Atlantic, an unusually high number of hurricane-force storms, with winds exceeding 74 mph, battered southeastern Greenland, Norway, and the coast of western Europe. The U.K. Met Office recently issued a report on the December and January storms that ravaged the British coast, saying
, "For England and Wales this was one of, if not the most, exceptional (two month) periods of winter rainfall in at least 248 years." No studies have confirmed a link between these intense winter storms and climate change, but some scientists think climate-driven changes in the jet stream
may be behind the wild weather.
13 Mar 2014:
Solar City Partnering With
Best Buy to Sell Residential Solar Leases
Solar City, a company that installs and leases solar panels to homeowners, is partnering
with big-box electronics seller Best Buy in hopes of boosting solar sales in California, Arizona, Hawaii, Oregon, and New
A Solar City residential installation in Hawaii
York. Solar City will station salespeople in 60 stores throughout those states to pitch the benefits of their 20-year solar contracts directly to consumers, and Best Buy will take a cut of the sales. Based on a homeowner's utility company and monthly electric bill, Solar City representatives will be able to quickly give potential customers an estimate of the costs and savings associated with a solar lease. Leasing enables a homeowner to avoid the large upfront costs associated with purchasing and installing solar panels by spreading those investments over a 20-year lease and locking in a set rate for electricity generated by the panels. Residential solar installations have accelerated in recent years due largely to the popularity of leasing programs, with 2013 showing the fastest growth ever.
12 Mar 2014:
Nine Chinese Cities Outpaced
Beijing in Air Pollution in 2013, Report Says
China's air pollution problems are more severe and widespread than previously thought, with nine cities experiencing more days of extreme air pollution than Beijing in 2013, according to
a new analysis by Greenpeace's Energy Desk. Fine particulate (PM2.5) pollution plagued dozens of cities and millions of people in China — most of them outside of Beijing, although the Chinese capital captured the most air pollution headlines last year. The city of Xingtai, southwest of the capital, fared worst, with 129 days of emergency air pollution — more than doubling Beijing's 60 days. More than half of the cities in the top 10 are in Hebei province south of Beijing, where many steel, cement, and coal-fired power plants are located. "There are now millions of Chinese people living in cities with air pollution above emergency levels for a third of the year, while other urban areas have gone a whole 12-month period with hardly any days of good-quality air," said a member of Greenpeace's East Asia climate and energy campaign. Beijing had only 13 days ranked as "good" on the U.S. air quality scale, along with one day considered "beyond index," or off the pollution scale.
11 Mar 2014:
'Space Frame' Wind Tower
Allows Turbines to Be Built in Remote Places
New wind power technology could bring turbines to hard-to-reach locations, according to engineers from General Electric
. The company has developed a new
type of wind tower, dubbed the "Space Frame Tower," consisting of metal latticework wrapped in weather-resistant fiberglass. Unlike conventional steel tube wind towers, the latticework can be bolted together on-site, which means the tower's framework can be transported using standard shipping containers and trucks, allowing taller wind towers to be installed in locations previously inaccessible to the longer trucks needed to transport conventional towers. The Space Frame Tower also has a five-leg base that's wider than conventional towers, increasing stability and ultimately allowing it to reach heights up to 450 feet — an advantage at sites where higher turbines can reach stronger winds. A 318-foot tall prototype is up and running in Tehachapi, California, with a 2.75 megawatt turbine nearly 400 feet wide.
10 Mar 2014:
Arsenic Remediation Project
Will Begin Decontaminating Water in India
New technology that removes arsenic from drinking water is set to be deployed on a large scale in India, according to
researchers from Lawrence Berkeley National Laboratory and an India-based water technology company. The device removes arsenic by passing electricity through steel plates submerged in a water reservoir. The electric current causes the plates to rust more quickly than they would under normal conditions, and the rust chemically binds to arsenic in the water and sinks to the bottom of the reservoir. The precipitated sludge can be removed from the tank, rendering the water safe to drink. Notoriously high levels of arsenic, a tasteless and odorless contaminant, naturally occur in groundwater sources in India, Bangladesh, and even California's Central Valley. Long-term exposure can cause cancer and severe damage to organs. A commercial plant is set to begin operations in West Bengal, India, this year and researchers estimate the drinking water can be sold for as little as eight cents per gallon.
07 Mar 2014:
U.S. Car-Sharing Programs Have
Taken 500,000 Cars off Roads, Report Says
The rapid growth of car-sharing programs has cut the number of vehicles on U.S. roads by more than half a million, according to new research
by AlixPartners, a consultancy group with clients in the automotive industry. The trend will continue beyond 2020, the group projects, at which point 4 million people will be participating in car-sharing programs and 1.2 million fewer cars will be on the road. Of the 10 cities surveyed, residents of Boston, home of the Zipcar company, were most aware of car-sharing programs. Young people and, surprisingly, households with children were least likely to own their own cars, the survey said. Roughly half of the people who had tried car-sharing had already decided not to purchase or lease their own car, and did not plan to do so in the future. Rather than environmental concerns, nearly 60 percent of interviewees said cost and convenience led them to participate in car-sharing.
06 Mar 2014:
Warm River Water Plays Major
Role in Arctic Sea Ice Melt, Study Finds
Relatively warm water flowing into the Arctic Ocean from rivers contributes significantly to Arctic sea ice melt each summer, a phenomenon that will intensify as the region warms, according to NASA researchers
. The river discharge not only melts coastal sea ice, it also has
a wider climate impact as it creates more open water, which is darker than ice and absorbs more heat from sunlight. As these NASA images show, when water from Canada's Mackenzie River flowed into the Beaufort Sea in the summer of 2012, average surface temperature of the open water rose by 6.5 degrees C (11.7 degrees F) after the pulse of river water. Flow from the Mackenzie raised sea surface temperatures as far as 350 kilometers (217 miles) from the coast. The researchers note that river discharge is becoming an increasingly important contributor to melting Arctic sea ice because the volume and temperature of fresh water discharge is increasing as inland Arctic areas warm more each summer.
An e360 Interview with Wendell Berry:
Strong Voice for Local Farms and the Land
Author Wendell Berry wrote about and practiced “sustainable agriculture” long before the term was widely used. His early writings in the 1970s, in which he argued against industrial agriculture and for small-scale, local-based farming, strongly influenced the U.S.
© Counterpoint Press
environmental movement. At age 79, Berry still speaks eloquently about the importance of local communities and of caring for the land, while warning about the destructive potential of industrialization and technology. In an interview with Yale Environment 360
, he talked about his Kentucky farm and why he has remained there, why sustainable agriculture faces an uphill battle, and why strong rural communities are important. “A deep familiarity between a local community and a local landscape is a dear thing, just in human terms,” Berry said. “It’s also, down the line, money in the bank, because it helps you to preserve the working capital of the place.”
Read the interview.
05 Mar 2014:
Routes of Young Sea Turtles
Shed Light on Mystery of Turtles' Lost Years
By placing satellite tags on newborn sea turtles along the coast of Florida and tracking them in the western Atlantic Ocean, researchers have gained new insights
into the early migrations of threatened and endangered
turtles during their so-called "lost years" between hatching and returning to coastal waters as large juveniles. Rather than swimming in the currents of the North Atlantic gyre, as scientists had assumed, the young turtles actually leave the gyre and travel to the Sargasso Sea, which lies in the middle of the North Atlantic Ocean. While there, sensors on the turtles' shells registered more heat than the scientists expected, leading them to believe
that the young turtles swim near the surface of the Sargasso, basking in sunlight and feeding on a type of seaweed that grows in deep ocean waters. "From the time they leave our shores, we don't hear anything about them until they surface near the Canary Islands, which is like their primary school years," said an author of the study.
04 Mar 2014:
Atlanta Leads U.S. in
Electric Vehicle Sales Growth
Atlanta is the fastest growing market for electric cars in the U.S., according to an analysis
by the electric vehicle charging network ChargePoint. Electric vehicle (EV) sales in Atlanta jumped by 52 percent from the third quarter to the fourth quarter of 2013, with more than
3,000 EVs sold in the final three months of the year, according to state motor vehicle records. Washington, D.C., was the second-fastest growing market, with a 21 percent increase in sales, and Portland, Oregon, had the third-fastest growth, at 19.4 percent. While Los Angeles added the most EVs — more than 5,000 — to its streets, for a 19 percent growth rate, Atlanta outpaced it on a per capita and percent growth basis. Nationally, EV sales grew by nearly 450 percent
in the first three quarters of 2013 compared to the same period in 2012. ChargePoint's CEO speculated that popularity is increasing because charging station networks have expanded and EV designs have improved. "We’re well on our way to having twice the number of EVs on the road by the end of 2014," he said.
03 Mar 2014:
Harsh Winter Causing Large
Die-off of Invasive Insects, Researchers Say
As a frigid winter takes a toll on the United States and Canada, invasive insect populations are also taking a hit. The U.S. Forest Service estimates that up to 80 percent
of emerald ash borers, which have been decimating ash tree populations, were killed by long
Emerald ash borer
stretches of bitter cold in the the upper Midwest this year. Several other insect pests, many of which have migrated northward because of milder winters in recent years, also are faring poorly this winter, including corn earworms and gypsy moths. Researchers remain skeptical, however, that the die-offs will have lasting effects on pest populations. Emerald ash borers in Chicago, for example, survived the sub-zero weather because Chicago temperatures fell only to -17 degrees F, rather than Minnesota's -20 degrees F, which seems to be a critical temperature threshold for the pests.
28 Feb 2014:
Seafaring Drones Could Reveal
Mysterious Lives of Sharks, Researchers Say
New automated watercraft
are helping scientists understand the secret lives of great white sharks, which gather in large numbers each winter in an area nicknamed the "White Shark Cafe." Although this stretch of ocean between Baja California and Hawaii
contains relatively few food sources, the sharks congregate and display strange behaviors, perhaps related to mating or feeding, one researcher explained to the San Francisco Chronicle
. Scientists haven't had a way to efficiently track and observe sharks in this environment, but new seafaring drone technologies might change that. For example, drones could follow migrations by homing in on acoustic tags on the sharks themselves. Marine biologists at Stanford
were recently able to track two great whites on their journeys from California to Hawaii and the White Shark Cafe, as the map shows, but current technology only allows scientists to recreate the sharks' journeys after monitoring tags pop off and are recovered. The new drones may prove useful not only for tracking sharks and other pelagic fish in real time, but also for collecting important ocean data such as temperature, acidity, and salinity, researchers said.