A microbial culture could be turned into a living energy storage system, researchers say, which could cheaply stockpile power from inconsistent solar and wind installations. Proponents of these alternative energy sources are investigating many different ways to store power for the inevitable moments when the sun isn’t shining or the wind isn’t blowing. The intriguing new idea involves “feeding” surplus power to the microorganisms instead, which combine it with carbon dioxide to create methane. That could then be stored and burned when needed. The method is sustainable too, as the carbon is taken from the atmosphere, not released from long-term storage in oil or coal [New Scientist].
The researchers have determined that a single-celled microorganism, a type of archaea, uses electricity to convert carbon dioxide and water into methane. Sustainable energy expert Tom Curtis comments that the use of microorganisms, rather than conventional catalysts, is a plus. “There are no noble metals involved, so it should be very cheap,” he says. Of the energy put into the system as electricity, 80% was eventually recovered when the methane was burned – a fairly high efficiency. “You don’t get all the energy back, but that’s a problem with any form of energy storage,” says Curtis [New Scientist].
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The latest advance in battery technology comes from viruses working on the nanoscale. Researchers have constructed a lithium-ion battery, similar to those used in millions of devices, but one which uses genetically engineered viruses to create the negatively charged anode and positively charged cathode [BBC News]. The tiny workers are bacteriophages, viruses that infect bacteria but are harmless to humans.
Three years ago, the same researchers created viruses that collected negatively charged particles of cobalt oxide and gold, which “grew” on a film to create the anode. Now, the researchers have added to that achievement, tackling the trickier task of making cathodes. The work was more difficult because the material had to be highly conductive in order to be effective and most candidate materials for cathodes are highly insulating [BBC News]. The researchers engineered viruses that coat themselves with iron phosphate. Then they then latch onto carbon nanotubes to create a network of highly conductive material [ComputerWorld]. Iron phosphate is generally not a good conductor, but its properties change when it’s organized on the nanoscale.
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As global warming’s effects become evident researchers have turned to geoengineering schemes that could slow the warming process, like a global “sunshade” produced by spraying sulfur aerosols into the atmosphere to reflect sunlight back into space. But a new study points out an (obvious in retrospect) drawback of that idea: It would seriously reduce the effectiveness of some solar energy facilities, which proponents hope would reduce our dependence on fossil fuels and thus prevent further global warming.
Researchers from the National Oceanic and Atmospheric Administration went back and examined data from 1991, when Mount Pinatubo erupted. The Philippine volcano ejected about 15 million metric tons of sulfur-dioxide–laden dust into the air, cooling the planet’s average temperature by about 0.6°C for nearly 2 years [ScienceNOW Daily News]. The researchers found that the eruption also reduced peak power output at a California solar-thermal plant by 20 percent. Solar thermal plants use arrays of mirrors to concentrate sunlight and turn it into a heat source for a conventional power plant; they are generally cheaper than traditional photovoltaic systems.
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Last year, President Mohamed Nasheed announced that his country would look to buy land for Maldivians to resettle on when sea levels rose and caused the low-lying islands to be uninhabitable. That plan proved too expensive, but Nasheed has now announced a $1.1 billion plan that will shift the Maldives entirely to renewable energy over the next ten years, making it the world’s first carbon-neutral nation.
The archipelago Indian Ocean nation consists of almost of 1,200 islands, of which only about 250 are inhabited. None of the coral islands measures more than 1.8 metres (six feet) above sea level, making the country vulnerable to a rise in sea levels associated with global warming [BBC]. Scientists at a meeting in Copenhagen last week predicted that glaciers and ice sheets melting as a result of global warming could boost the level of the world’s oceans by as much as a metre by the end of the century [CBC].
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The governors of Washington, Oregon, and California are considering plans for a “green freeway” that would see alternative fueling stations implemented along Interstate 5 from Canada to Mexico. As the plan stands, motorists eventually would be able to pull off at I-5 rest stops for more than a cup of coffee and roadside relief: They also would be able to charge, or swap out, their electric-vehicle batteries or fill their tanks with biodiesel, ethanol, hydrogen or compressed natural gas [The Seattle Times].
Opponents to the plan say it would compete with private businesses, but Jeff Doyle from Washington’s Department of Transportation said the state wouldn’t want alternative-fuel stations to disrupt rest-area traffic, so contract companies would have to provide small, low-profile setups. Doyle added that rest-stop fueling sites would be self-service and likely to have little or no on-site staffing [The Seattle Times]. While the plan is facing many rounds of approval before it can become a reality, it does fit into the new administration’s push for green jobs and it would most likely qualify for stimulus money that would get the project going [EcoGeek].
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Energy and environmental issues took center stage in President Barack Obama’s first speech to a joint session of Congress last night. He asked Congress to send him legislation that would confront global warming by capping carbon dioxide emissions, and emphasized that clean energy technology can help the United States emerge from the recession.
Obama said: “It begins with energy. We know the country that harnesses the power of clean, renewable energy will lead the 21st century…. Well I do not accept a future where the jobs and industries of tomorrow take root beyond our borders—and I know you don’t either. It is time for America to lead again” [The New Republic]. He noted that the stimulus package includes significant investments in alternative energy research and development, as well as money for making buildings more energy efficient and upgrading the electrical grid. He also pledged to double the use of renewable energy and invest $15 billion dollars in the development of new technologies each year – including wind, solar, advanced biofuels, more fuel-efficient automobiles, and “clean coal” [Grist].
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The joke about hydrogen-powered cars is that they’re about 10 years away–and always will be. The technology has been held up largely by the high cost of hydrogen fuel cells, but now researchers say they’ve found a way to bring down the cost dramatically by making a key component out of carbon nanotubes instead of platinum. More than half the cost of fuel-cell stacks comes from platinum, according to the Department of Energy. “Fuel cells haven’t been commercialized for larger-scale applications because platinum is too expensive,” says Liming Dai [Technology Review], the lead author of the new study.
Researcher found that tightly packed, vertically aligned carbon nanotubes doped with nitrogen were more effective as catalysts than platinum, which is usually used to help oxygen react within the fuel cell. That is a vital stage of the fuel cell cycle. Rather than burning fuel to create heat to power a turbine, fuel cells turn chemical energy directly into a flow of electricity. Hydrogen gas, for example, is pumped past one electrode (the anode), where it is split into its constituent electrons and protons. The electrons then flow out of the anode, providing electrical power, while the protons diffuse through the cell. Electrons and protons both end up at a second electrode (the cathode), where they combine with oxygen to form water [New Scientist].
That second reaction is very slow, so engineers have developed cathodes made out of materials that act as chemical catalysts and speed up the reaction. Until now, platinum was considered the best catalyst, but now carbon nanotubes with a trace of nitrogen (the critical ingredient) have left the precious metal in the dust.
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In another step forward for biofuels, a commercial jet took to the skies yesterday over New Zealand to test a new jet fuel blend that uses oil from the oily jatropha plant. Air New Zealand announced that a Boeing 747 plane flew for about two hours yesterday, running on a 50/50 blend of conventional jet fuel and biofuel. Jatropha—a weedy bush from Africa that produces seeds rich in oil—was selected because it is not a food crop and can be grown on land unsuitable for food production. The roughly three tons of liquid jatropha biofuel came from plants grown in India, Malawi, Mozambique and Tanzania, the airline says [Scientific American].
Air New Zealand is the second airline to test-fly a jet plane powered by biofuel. The first was Virgin Atlantic Airways, which in February flew a Boeing 747-400 from London to Amsterdam with one of its four tanks filled with jet fuel containing a 20 percent blend of biofuel made of coconut and babbasu oil [Greentech Media]. Meanwhile, other airlines are developing jet fuels derived from algae or oilseed plants: Continental Airlines and Japan Airlines both have test flights scheduled for January.
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The U.S. auto industry may be floundering in part because it failed to embrace fuel-efficient and alternative fuel cars, but U.S. companies can still position themselves to lead the way in the next phase of automobile manufacturing, a group of battery makers is arguing. Fourteen companies have announced that they’re teaming up and will seek $1 billion in federal aid to build a large-scale factory that produces lithium-ion batteries, which would be used in plug-in electric cars. Many experts believe battery technology and manufacturing capacity could become as strategically important as oil is today. Auto makers, including General Motors Corp. and Ford Motor Co., say they plan to roll out plug-in electric cars by 2010 [The Wall Street Journal].
The consortium, which calls itself the National Alliance for Advanced Transportation Battery Cell Manufacture, is modeled after a group formed in 1987 by computer-chip manufacturing companies that were struggling to compete with Japanese chip makers. The situation is similar now, experts say, as Asian companies dominate the battery market. “A small, fragmented (U.S.) battery industry will not long survive in the face of determined Asian competition,” Ralph Brodd, a consultant to battery manufacturers, said…. “(Other) countries understand that he who makes the batteries will one day make the cars,” he said [Reuters].
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President-elect Barack Obama has thrilled the scientific community with the leaked news that he plans to nominate a Nobel Prize-winning physicist with a passion for green technology for the post of energy secretary. The likely nominee, Steven Chu, currently heads the Lawrence Berkeley National Laboratory, and shared the Nobel in physics in 1997 for developing a method to cool and trap atoms.
Recently, however, Chu’s interests have shifted away from particle physics and towards finding scientific solutions for global warming. In an interview last year, Chu said he began to turn his attention to energy and climate change several years ago. “I was following it just as a citizen and getting increasingly alarmed,” he said. “Many of our best basic scientists [now] realize that this is getting down to a crisis situation” [Washington Post]. Since he became director of Lawrence Berkeley Lab in 2004 he has focused on making it a world leader in alternative energy research, spearheading research initiatives on solar energy and biofuels.
Obama is also expected to nominate Carol Browner, the EPA administrator under President Clinton, as the top White House official on climate and energy policy, and Lisa Jackson, who was until recently was New Jersey’s environmental protection chief, to head the EPA. Along with Chu, these people will be at the center of Obama administration’s energy and environment policy, which aims to reduce greenhouse gas emissions growth and have energy efficiency play an important role in an expected economic stimulus package [CNET].
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Genetically engineered bacteria can now produce long-chain alcohols that could be used as biofuel, scientists report in the Proceedings of the National Academy of Sciences [subscription required]. Remarkably, the researchers synthetically modified the bacteria’s metabolism to churn out a type of energy-rich alcohol not normally found in nature. “Previous metabolic engineering work typically produces compounds that already exist in nature,” says coauthor James Liao… “Our work here aims to produce compounds that are not synthesized in nature” [Science News].
In addition to ordinary genetic engineering, which involves taking genes from different species (in this case, genes from yeast and a cheese-making bacteria), the new study also required a third, custom-made artificial gene. The three genes were inserted into the genome of E. coli bacteria. The researchers designed the genes to extend E. coli’s metabolic pathway so that toward the end, the precursor compounds that would normally get converted into amino acids instead turn into long-chain alcohols [Technology Review]. These long-chain alcohols string together six carbon atoms, packing in more potential energy per molecule. Ethanol has only two carbon atoms, and no other naturally-occurring alcohol contains more than five.
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A marine engineer and naval architect has designed a new way of drawing energy out of slow-moving rivers and gentle tides. The researcher says the unobtrusive device, which was inspired by the way fish move through the water, could be set down on riverbeds or suspended in the ocean just about anywhere. Existing technologies which use water power, relying on the action of waves, tides or faster currents created by dams, are far more limited in where they can be used, and also cause greater obstructions when they are built in rivers or the sea. Turbines and water mills need an average current of five or six knots to operate efficiently, while most of the earth’s currents are slower than three knots [Telegraph].
Engineer Michael Bernitsas’s device is called VIVACE, which stands for Vortex Induced Vibrations for Aquatic Clean Energy. How does the technology work? A cylinder-shaped object in the water current causes alternating vortices to form above and below the cylinder. The vortices push and pull the passive cylinder up and down on its springs, creating mechanical energy. Then, the machine converts the mechanical energy into electricity [Greenbang]. Bernitsas explains that fish also create vortices as they swim, and in a large school each fish curves around the vortices left by the fish in front, using the tiny whirlpools to propel themselves forward.
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A newly discovered tree fungus could be on its way to the gas station. The fungus, Gliocladium roseum, is able to turn plant matter into gaseous hydrocarbons that are almost chemically identical to diesel fuel. “This is the only organism that has ever been shown to produce such an important combination of fuel substances,” said researcher Gary Strobel from Montana State University. “The fungus can even make these diesel compounds from cellulose, which would make it a better source of biofuel than anything we use at the moment” [LiveScience].
The fungus grows inside trees in the rainforests of Patagonia, in the southern part of Argentina and Chile. After discovering the new fungus wedged between cells in a stem from an Ulmo tree (Eucryphia cordifolia), Strobel and colleagues cultured the organism, collected the gaseous compounds it produced, and ran the compounds through a mass spectrometer to identify them. When he saw the printout, Strobel says, “every hair on my body stood up.” The list included octane, 1-octene, heptane, 2-methyl, and hexadecane–all common components of diesel fuels [ScienceNOW]. The gaseous compound, dubbed “myco-diesel,” is thought to be used by G. roseum to poison other fungi.
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As the turmoil continues in the world’s financial systems and countries brace for an economic downturn, many environmentalists and green tech entrepreneurs are posing the question: How will this crisis impact the young renewable energy sector?
Some worry that ambitious projects won’t be able to get the financing they need from troubled banks wary of lending money, while others note that oil prices have dropped fast based on predictions of lower demand. Advocates are concerned that if the prices for oil and gas keep falling, the incentive for utilities and consumers to buy expensive renewable energy will shrink. That is what happened in the 1980s when a decade of advances for alternative energy collapsed amid falling prices for conventional fuels [The New York Times].
In Europe, environmental ministers are meeting to finalize the European Union’s goals for cutting the greenhouse gas emissions that cause global warming, but new discord has broken out. Nations like Italy and Poland have begun to argue that emission cuts must be scaled back to avoid further hardship for industry during the hard economic times. Italian Prime Minister Silvio Berlusconi said: “Our businesses are in absolutely no position at the moment to absorb the costs of the regulations that have been proposed” [BBC News].
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A green technology company that turns pond scum into biofuel has announced plans to build the first commercial-scale algae farm, a $92 million complex of greenhouses that are expected to eventually cover 247 acres. The company, GreenFuel Technologies, wants to recycle carbon dioxide from factories and power plants, and will use that gas plus sunshine to nourish its algae fields. The process provides two environmental benefits in one, as it simultaneously absorbs carbon dioxide emissions and provides a renewable source of fuel.
As prices for vegetable oils used to make biofuels has remained high, algae advocates have looked upon the slime as a possible savior. After all, algae are oily and could potentially produce more oil per acre than palm or other oil-yielding crops. Companies haven’t yet succeeded in producing algae affordably and at significant volumes in spite of years of research and development, but a number of venture-backed companies cropped up to take on the challenge [Greentech Media]. While the companies Sapphire Energy and Solazyme have also garnered attention and funding, GreenFuel Technologies seems to have beat the competition to the punch on commercializing its technology.
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