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Biodesign's Rittmann offers promising perspectives on society's energy challenge
June 04, 2008Perhaps there is no greater societal need for scientific know-how than in finding new ways to meet future energy demands. Skyrocketing gas prices, an uncertain oil supply, increasing demand from around the world, and the looming threat of climate change have made identifying and developing realistic energy alternatives a national priority.
For Biodesign Institute researcher Bruce Rittmann, the threat of global warming also presents a significant opportunity for innovation and fresh solutions to today's energy challenges.
"Beginning with the Industrial Revolution, the unprecedented expansions of human population and economic activity have been based on combusting fossil fuels," said Rittmann. "Today, fossil fuels provide 80 percent of the energy needs to run human society worldwide: 34 percent petroleum, 32 percent coal, and 14 percent natural gas."
In a new Perspective article published in the journal Biotechnology and Bioengineering, Rittmann points the way toward developing bioenergy as the best realistic alternative to meet our current and future energy needs while cutting back on the use of fossil fuels. Rittmann directs the Center for Environmental Biotechnology and is a professor in the Ira A. Fulton School of Engineering's Department of Civil and Environmental Engineering.
"The only way that human society has a realistic way of slowing and reversing global warming is bioenergy; and it has to be bioenergy that is done right," said Rittmann, who leads many of Biodesign's sustainability-themed research projects. "Most critically, we need to be able to have bioenergy sources that work on a very, very large scale."
Besides the scalability issues of bioenergy, any technologies developed must also be able to produce energy while minimizing damage to the environment or affecting the world's food supply.
For Rittmann, the most obvious renewable-energy solution - one that passes the tests of scalability, environment, and food - stems from the very factor that makes life on Earth possible: the sun.
"The good news is that we have plenty of energy from the sun. Every day, the sun sends to the earth's surface about 173,000 terawatts of energy, or more than 10,000 times more that is used by human society. So, we have a lot of what we like to call 'upside potential' for capturing sunlight energy."
Up to now, harnessing the energy of the sun has proven to be technically and socially challenging. In particular, approaches to make biofuels from crops such as corn have been met with skepticism in recent days.
"When people think of capturing sunlight energy in biomass, they focus on plants, which are familiar. However, plants are quite inefficient at capturing sunlight energy and turning it into biomass that can be used a fuel," Rittmann explains. As a result, plants could provide only a tiny fraction of our society's energy needs. "Obviously, we need the plants for producing food and sustaining natural ecosystems. Plants simply fail the scalability, environmental, and food tests."
In contrast, microoganisms, the smallest forms of life on Earth, can meet the scalability and environmental tests. Rittmann sees a vast untapped potential of using microbes in service to society to meet our energy challenges.
"Photosynthetic bacteria can capture sunlight energy at rates 100 times or more greater than plants, and they do not compete for arable land," Rittmann said. This high rate of energy capture means that renewable biofuels can be generated in quantities that rival our current use of fossil fuels.
In addition, non-photosynthetic microorganisms are capable of converting the energy value of all kinds of biomass, including wastes, into readily useful energy forms, such as methane, hydrogen, and electricity.
"Microorganisms can provide just the services our society needs to move from fossil fuels to renewable biofuels," said Rittmann. "Only the microorganisms can pass all the tests, and we should take full advantage of the opportunities that microorganisms present."
Arizona State University
In a new Perspective article published in the journal Biotechnology and Bioengineering, Rittmann points the way toward developing bioenergy as the best realistic alternative to meet our current and future energy needs while cutting back on the use of fossil fuels. Rittmann directs the Center for Environmental Biotechnology and is a professor in the Ira A. Fulton School of Engineering's Department of Civil and Environmental Engineering.
"The only way that human society has a realistic way of slowing and reversing global warming is bioenergy; and it has to be bioenergy that is done right," said Rittmann, who leads many of Biodesign's sustainability-themed research projects. "Most critically, we need to be able to have bioenergy sources that work on a very, very large scale."
Besides the scalability issues of bioenergy, any technologies developed must also be able to produce energy while minimizing damage to the environment or affecting the world's food supply.
For Rittmann, the most obvious renewable-energy solution - one that passes the tests of scalability, environment, and food - stems from the very factor that makes life on Earth possible: the sun.
"The good news is that we have plenty of energy from the sun. Every day, the sun sends to the earth's surface about 173,000 terawatts of energy, or more than 10,000 times more that is used by human society. So, we have a lot of what we like to call 'upside potential' for capturing sunlight energy."
Up to now, harnessing the energy of the sun has proven to be technically and socially challenging. In particular, approaches to make biofuels from crops such as corn have been met with skepticism in recent days.
"When people think of capturing sunlight energy in biomass, they focus on plants, which are familiar. However, plants are quite inefficient at capturing sunlight energy and turning it into biomass that can be used a fuel," Rittmann explains. As a result, plants could provide only a tiny fraction of our society's energy needs. "Obviously, we need the plants for producing food and sustaining natural ecosystems. Plants simply fail the scalability, environmental, and food tests."
In contrast, microoganisms, the smallest forms of life on Earth, can meet the scalability and environmental tests. Rittmann sees a vast untapped potential of using microbes in service to society to meet our energy challenges.
"Photosynthetic bacteria can capture sunlight energy at rates 100 times or more greater than plants, and they do not compete for arable land," Rittmann said. This high rate of energy capture means that renewable biofuels can be generated in quantities that rival our current use of fossil fuels.
In addition, non-photosynthetic microorganisms are capable of converting the energy value of all kinds of biomass, including wastes, into readily useful energy forms, such as methane, hydrogen, and electricity.
"Microorganisms can provide just the services our society needs to move from fossil fuels to renewable biofuels," said Rittmann. "Only the microorganisms can pass all the tests, and we should take full advantage of the opportunities that microorganisms present."
Arizona State University
Bioenergy Current Events and Bioenergy News RSSMandate for biofuels production requires science-based policy and global perspective
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Scientists at Michigan State University have identified a new protein necessary for chloroplast development. The discovery could ultimately lead to plant varieties tailored specifically for biofuel production.
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Projected California warming promises cycle of more heat waves, energy use for next century
As the 21st century progresses, major cities in heavily air-conditioned California can expect more frequent extreme-heat events because of climate change.
Duckweed genome sequencing has global implications
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Feeding and fueling the future: the bioenergy potential of reviving abandoned agricultural land
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Abandoned farmlands are key to sustainable bioenergy
Biofuels can be a sustainable part of the world's energy future, especially if bioenergy agriculture is developed on currently abandoned or degraded agricultural lands, report scientists from the Carnegie Institution and Stanford University.
Energy crops take a roasting
A process used to roast coffee beans could give Britain's biomass a power boost, increasing the energy content of some of the UK's leading energy crops by up to 20 per cent.
New study links fate of personal care products to environmental pollution and human health concerns
Parental concerns in maintaining germ-free homes for their children have led to an ever-increasing demand and the rapid adoption of anti-bacterial soaps and cleaning agents. But the active ingredients of those antiseptic soaps now have come under scrutiny by the EPA and FDA, due to both environmental and human health concerns.
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