Cooperative Extension San Joaquin County
University of California
Cooperative Extension San Joaquin County

Posts Tagged: AB32

Switchgrass could become high-yielding biofuel crop

California must continually increase its use of renewable fuels to meet mandated reductions in greenhouse gas emis­­sions (GHG). The state's historic Global Warming Solutions Act of 2006 (AB32) requires that alternative fuels displace 6 percent of gasoline and diesel use now, and 9 percent by 2012. The number goes up to 11 percent in 2017 and 26 percent in 2022.

California has been meeting these goals by importing millions of gallons of ethanol: 80 percent of the supply is corn ethanol from the Midwest, 12 percent is sugarcane ethanol from Brazil, and the rest is ethanol from corn grown here. By 2012, demand for ethanol fuel will rise to 1.62 billion gallons per year. If California does not increase its production of corn for ethanol, it will need to import 95 percent of that amount.

In the second year of production, switchgrass in El centro yielded 17.6 tons per acre, and productivity tends to increase through the third and fourth years.
However, the overall cost of producing and transporting corn ethanol is significant, both in dollars and greenhouse gas emissions. Whether average corn ethanol reduces greenhouse gas emissions is a matter of dispute, as the GHG that result from its production and transportation to customers may cancel out the hoped-for reduction in carbon footprint.

In the search for a better alternative, scientists have been investigating conversion of cellulose to ethanol. Technical challenges remain, but cellulose offers a potentially abundant feedstock for biofuels.

One of the plants seen as a possible dedicated biofuel crop in the United States is switchgrass. It is about 40 percent cellulose and grows widely in the Midwest and the South. However, it is not native to California and has not been produced here.

Recent studies by UC Davis scientists are the first ever to report tests of different switchgrass ecotypes in California, - and are published in the current California Agriculture journal.

Scientists evaluated the productivity of the two main ecotypes of switchgrass, lowland and upland, under irrigated conditions across four diverse California ecozones — from Tulelake in the cool north to warm Imperial Valley in the south.

”It is important to know how much biomass can be produced in the state before deciding to pursue cellulosic ethanol," says UC Davis plant scientist Gabriel Pedroso. "California has very diverse climatic regions, which affect the adaptability and productivity of switchgrass.”

Because it is a deep-rooted perennial grass, switchgrass promotes soil conservation. It stores carbon in its root system, and makes efficient use of water by virtue of its C4 photorespiration.

Switchgrass requires an establishment year.

"In the second year of production, the lowland varieties grown in the warm San Joaquín and Imperial valleys yielded up to 17 tons per acre of biomass, roughly double the biomass yields of California rice or maize," Pedroso said.

Because of switchgrass' high biomass yields, it is considered a good candidate for dedicated energy crops.

Because it can be used both as forage and as a biofuel crop, switchgrass may be well suited to California, a state with a large livestock industry and higher ethanol consumption than any other.

While the field trial results are promising, commercial, large-scale conversion processes for cellulose to sugars and fuels are just beginning to be demonstrated.

Cellulose is a complex matrix of smaller sugar molecules and fibrous material in plant cell walls. It is the principal structural component of all plant material, including residues and organic materials in municipal solid waste. If it were possible to efficiently break it down into simple sugars, if would become a productive source of ethanol, and would significantly reduce GHG.

Posted on Wednesday, August 10, 2011 at 8:34 AM
  • Author: Janet L. White
Tags: AB32 (2), biofuel (6), cellulose (1), global warming (8), greenhouse gas (4), switchgrass (2)

California's climate-change law: Behind the scenes

Read the bill. That was the first policy lesson that Linda Adams, Secretary of the California Environmental Protection Agency, brought to the newly minted Ph.D.’s at the Graduate Research Symposium of UC Berkeley’s Department of Environmental Science, Policy, and Management (ESPM) earlier this month, where she delivered the keynote address.

The bill Adams was referring to was AB 32, the landmark Global Warming Solutions Act of 2006, on which she was the lead negotiator. She told a harrowing tale of the legislative pipeline.

“When Governor Schwarzenegger appointed me in 2006… I was just vaguely aware of AB 32, which was actually very close to his desk,” Adams said. “Being a good former legislative staffer, the first thing I did was read the bill. And much to my horror, what the governor wanted — a market-based approach to reducing emissions — was not only not in the bill but actually prohibited.”

Adams’ discovery resulted in a fight for a comprehensive approach to reducing emissions that California businesses would support, including a cap-and-trade program and complementary measures such as low-emissions vehicles, renewable energy, and increased energy efficiency. The bill that ultimately passed was the nation’s first major climate-change legislation, and was what the California Air Resources Board refers to as the “first-in-the-world comprehensive program of regulatory and market mechanisms to achieve real, quantifiable, cost-effective reductions of greenhouse gases.”

Her achievements resonated with the audience; environment and climate-change related work is the one common thread among the diverse lines of scientific inquiry pursued at ESPM. Research presented by the graduating Ph.D. students included modeling the impact of climate change on a Bay Area redwood forest, studying changes bird populations in the Sierrra Nevada, analyzing the politics of chemical monitoring, and studying the growth of eco-labels and sustainability ratings—so-called “green” products and services.

Putting the science in government

This broad spectrum of inquiry meshed well with the key theme of Adam’s talk: Science matters.

“Every policy regulation we make here at Cal EPA is based on science,” Adams said. “We rely on our experts when developing policies and… we depend on the accuracy, the timeliness, the relevance, and the needed answers they can supply,” she said.

To the delight of a room filled with fresh job-seeking Ph.D.'s, Adams said that Cal EPA employs hundreds of scientists in various areas of expertise.

What do they do? As an example, Adams cited an agency-wide investigation into a spike in birth defects in the small town of Kettleman City.

“It involved scientists from each department looking into potential links to water, soil, air, and/or pesticide pollution,” she said. “The Department of Pesticide Regulation provided models of pesticide activity in the formative months of pregnancy; the Air Resources Board (ARB) monitored the air in the area; the Water Board tested the tap water and canal for arsenic and other pollutants; and the Department of Toxic Substances Control tested the soil for contamination.

The role of forests

The new world of AB 32 will generate the need for new areas of scientific expertise at Cal EPA. In additional to a full spectrum of chemical and environmental monitoring, there will be growing demand for forestry and reforestation knowledge.

In the legislative negotiations, businesses asked for, and won, the market-based cap-and trade-program. They were not so keen on the “cap” part, according to Adams, but the “trade” part gave them the ability to purchase offsets. This means that not all their reductions have to come at their factory or refinery location; a limited portion can from areas outside their actual area of operation.

That translates to forests. Of the four offset protocols adopted by the ARB, two were forestry protocols: one for urban forestry and one for U.S. forest reforestation and forest management projects.

“We already have over 100 forestation and forest management projects submitted for approval as offsets all over the United States,” Adams said. Cal EPA is also exploring the international market for carbon reduction, through cutting-edge pilot forest redevelopment programs in Chiapas, Mexico, and Acre, Brazil.

Calling to account

As the state begins to implement AB 32 and build a national and international accounting framework, Adams said science will be especially important.

“We need to ensure that all reductions achieved are real, permanent, quantifiable, verifiable, and enforceable, and we rely on the science to provide reduction and emission calculation methods, to identify procedures for project monitoring, reporting parameters, and verification,” she said. “We need the scientific backing to reinforce the policy outcomes we seek, and the research to determine if those sought-after outcomes are possible.… It’s all one continuous cycle.”

In addition to the keynote address, the May 6 Berkeley symposium, dubbed “Gradfest,” also had 15 research presentations, two poster sessions, and a career panel and to help usher ESPM graduates into the various professional arenas of academia, government, nonprofit, and the private sector.

Pictured above, left to right: Alex Harmon-Threatt, Graham Bullock, Mike Wasserman, Secretary Linda S. Adams, Pauline Kamath, Morgan Tingley, and Ben Ramage

Posted on Wednesday, May 25, 2011 at 4:38 PM
  • Author: Ann Brody Guy
 
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