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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

Volunteer weather observation helps scientists track storms

Sponsored in part by the National Oceanic and Atmospheric Administration (NOAA) and the National Science Foundation (NSF), the Community Collaborative Rain, Hail and Snow Network (CoCoRaHS) is a grassroots volunteer network of backyard weather observers.

With a presence in every state in the country, volunteers from all backgrounds work together to measure and map precipitation (rain, hail and snow) in their local communities. The data is used to help scientists across the country measure and track this very important and highly variable part of the climate system. By having thousands of volunteers nationwide providing precipitation data, scientists can track each storm system as it passes across the country and see how precipitation systems vary geographically, seasonally and inter-annually.

Many additional volunteers are needed to provide data for this long-term effort. CoCoRaHS provides training, education and an interactive website to which data is uploaded. It takes about five minutes a day to observe and upload data.

Volunteers can participate as much or as little as they wish. Individuals, groups and schools are welcome to participate. Currently volunteers range from kindergarteners to people in their 90s.

In addition to data collection, CoCoRaHS has many other opportunities for volunteers to become involved in this exciting project – locally, statewide and nationally.

To learn more or to sign up, please visit the CoCoRaHS website.

For additional questions, contact Nolan Doesken at the State Climatologist Colorado Climate Center, Department of Atmospheric Science, Colorado State University Fort Collins, CO 80523.  He can be reached by email at or by phone 970.491.3690.


CoCoRaHS Volunteers with gauges. Photo from CoCoRaHS' website.


Posted on Wednesday, May 18, 2011 at 9:00 AM
  • Author: Chris M. Webb

Consider fire risk when planning improvements

Most people planning home improvement projects take into account how improvements will affect the home’s ability to withstand rain and weathering. We should also consider the threat of wildfire when planning home improvement projects this spring.

Most homes that burn during wildfires are ignited by flying embers landing on combustible material on or near homes. A wildfire passes by a home quickly, usually in a few minutes, while the exposure to flying embers can last for an hour or more. Therefore, activities homeowners undertake to make their home less ignitable from embers do the most to ensure its survival.

Home improvements should be made with wildfire risk in mind.

The most important home upgrade homeowners can do to reduce wildfire risk is to replace wood shake roofs with Class A roofs. Single-paned windows should also be replaced with dual-pane windows (with at least one pane being tempered). Combustible siding can also be vulnerable, but replacing it with non-combustible siding is less important if you have done a good job of locating and maintaining vegetation near your home. Replacing combustible decks with noncombustible decking products will also reduce risk.

Even though these upgrades are expensive, they reduce the likelihood that you will experience the cost and trauma of losing a home in a wildfire. If you cannot afford to undertake these projects this year, there are less expensive projects you can take on to reduce wildfire risk. These center on maintaining your home in good condition by replacing worn boards , sealing cracks in locations where embers can enter the home, and protecting vulnerable areas with non-combustible materials and coverings.

Even if you have already upgraded your home to resist fire by installing a new roof, windows, or deck, it is important to maintain those home components in their proper condition so embers cannot gain entrance to the home. Creating defensible space by clearning flammable vegetation and debris is also crucial to reducing your wildfire risk. For more information on the performance of building materials in a wildfire, please see or For more on creation of defensible space, contact your local fire agency and see

Suggested home maintenance projects to reduce wildfire risk


  • Plug roof openings: Install end-stops (bird-stops) at the edge of your roof if it has a gap between the roof and the sheathing (as with a clay barrel tile roof).
  • Protect roof edges: Install metal angle flashing at the roof edge to protect the roof sheathing and fascia board, especially if there are gutters attached that can hold combustible pine needles. Even a Class A roof cannot protect the wood sheathing under it if the roof edge is unprotected.
  • Protect roof eaves: “Box in” your open eaves with sheathing, such as a fiber cement soffit or higher grade plywood.
  • Skylights: Particularly on steep or flat roofs, replace plastic skylights with skylights that use tempered glass in the outer pane.


  • Maintain siding: Fill gaps in siding and trim materials with a qood quality caulk help keep out embers. Replace warped or degraded siding.



  • Protect vents: Inspect the vents into your attic and crawl space. Make sure the screens are in good condition. Replace ¼ inch mesh screen with 1/8 inch mesh screening.


  • Maintain decks: Replace deck boards that are less than an inch thick with two inch thick boards. Remove combustible materials from under the deck.
  • Protect combustible siding: Install metal flashing between a deck and combustible siding to protect it from accumulated debris that can ignite during ember attack.
  • Remove flammable material from under decks: If your deck is made from wood or wood-plastic lumber decking, remove combustibles (firewood, lumber, etc.) from under the deck.


  • Replace gates: Replace combustible gates and sections of wooden fences within five feet of the house with noncombustible materials and components.


  • Adjust garage doors: Your garage door can be very “leaky” to embers. Since most people store combustibles in their garage, make sure your garage door is well sealed at the edges.
Posted on Wednesday, May 11, 2011 at 9:13 AM
  • Posted By: Jaime Adler
  • Written by: Susie Kocher and Steve Quarles
Tags: wildfire (39)

New life for the delta ecosystem

The San Joaquin/Sacramento Delta and Suisun Marsh were once part of a continuous, enormously productive aquatic ecosystem that supported dense populations of fish from Sacramento perch to salmon, huge flocks of wintering waterfowl, and concentrations of mammals from beaver to tule elk. This amazing ecosystem is gone and cannot be brought back.

The once vast marshes have been turned into farmland and cities, protected by a complex system of levees. The patchy remnants of the original ecosystem are disappearing fast, as more and more native plants and animals become extinct or endangered. In their place, hundreds of alien species thrive in the altered conditions—crabs, clams, worms and fish from all over the world.

We have a choice. We can let the ecosystem continue to slide towards being a mess of alien species that live in unsavory water flowing through unnatural pathways, or we can take charge and create a new ecosystem that contains the elements we want. Those elements include native species and clean water that flows in more natural patterns, creating a better environment for fish and people.

The State Water Resources Control Board recently supported this concept by recommending that much more fresh water flow through the estuary to the ocean to create a sustainable estuarine ecosystem.  More water is only part of the recovery picture, however, because the flows must be managed in new ways and flow through restored habitats. The historical ecosystem can be used only as a model for the new system, mainly to identify conditions that favor remnant native species and have other desirable features. But the new ecosystem will be quite different in its locations, its biota, and how it works.

High variability in environmental conditions in both space and time once made the upper San Francisco Estuary highly productive for native biota, so variability is clearly a key concept for our new ecosystem (Moyle, et al. 2010). Achieving a variable, more complex estuary requires policies that create the following conditions:

  1. Internal Delta flows that create a tidally-mixed, upstream-downstream gradient in water quality, with minimal cross-Delta flows. At times much of the water in the present Delta flows towards the big export pumps in the South Delta.  Fish trying to migrate upstream or downstream find this very confusing, often lethally so.
  2. Slough networks with more natural channel geometry and less diked, rip-rapped channel habitat.
  3. More tidal marsh habitat, including shallow (1-2 m) sub-tidal areas, in both fresh and brackish zones of the estuary.
  4. Large expanses of low salinity (1-4 ppt) open water habitat in the Delta.
  5. A hydrodynamic regime where salinities in the upper estuary range from near-fresh to 8-10 ppt periodically to discourage alien species and favor desirable species.
  6. Species-specific actions that reduce abundance of non-native species and increase abundance of desirable species, such as active removal of undesirable clams and vegetation.
  7. Abundant annual floodplain habitat, with additional large areas that flood in less frequent wet years.
  8. Treating the estuary as one inter-connected ecosystem, recognizing that changes in one part of the system will likely effect the other parts.

These habitat actions collectively provide a realistic, if experimental, approach to improving the ability of the estuary to benefit desirable species. Some of these goals are likely to be achieved without deliberate action as the result of sea level rise, climate change, and failure of unsustainable levees in some parts of the Delta. But in the near term, habitat, flow restoration and export reduction projects can allow creation of a more variable and more productive ecosystem than now exists, while accommodating irreversible changes to the system.

What a multi-purpose, eco-friendly delta could look like. Click on the image to view an interactive form of the map that lets you see descriptions of what each area might look like in a future eco-friendly delta.

(This post first appeared on the CaliforniaWaterBlog.)

Update: The National Research Council has taken an interest in plans to conserve habitat for endangered and threatened species in the Sacramento-San Joaquin Delta while continuing to divert water for agricultural and urban use in Southern California. On May 5, the council declared the draft Bay Delta Conservation Plan incomplete, difficult to understand and still needing much work.

Further Reading:

Moyle, P.B., J.R. Lund, W. Bennett and W. Fleenor (2010), Habitat Variability and Complexity in the Upper San Francisco EstuarySan Francisco Estuary and Watershed Science 8(3).

Cunningham, L. (2010), A State of Change: Forgotten Landscapes of California, Heyday Books, Berkeley.

Posted on Thursday, May 5, 2011 at 2:23 PM
  • Posted By: Trina Wood
  • Written by: Peter Moyle, Professor of Fish Biology, UC Davis

Biofilms: Friends or foes?

"Biofilms" surround us. They pervade our environment and our bodies. They form the dental plaque on our teeth and establish the chronic infections in our childrens' ear canals. They can spread on the watery surface of a contact lens.

Biofilms are now thought to be involved in 80 percent of human microbial infections, and are likely responsible for the resistance of chronic infections to antibiotics. Biofilms even form around "extremophiles" – such as the ancient blue-green cyanobacteria that thrive in extreme environments like the hot springs of Yellowstone National Park and the lake crusts of Antarctica. These microorganisms with fossil records going back 3.5 billion years also clog water pipes and create the slimy film on rocks in a pond.

A “biofilm” is a protective environment created by a microbial population. When microbes such as bacteria sense a “quorum” of their kind nearby, they begin to modify their genetic instructions to produce polysaccharides. The result is a sticky matrix that enables them to adhere to each other, and to surfaces.

This is the thin biofilm that first forms on the gravel in a constructed wetland.

But there is more to this story. Biofilms can also be employed for our benefit. Many sewage treatment plants include a stage where wastewater passes over biofilms, which “filter” — that is, extract and digest — organic compounds. Biofilms are integral to our current engineering processes for wastewater treatment.

Similarly, they play an essential role in constructed wetlands (CW), the artificial systems that approximate natural wetlands and that are used to treat wastewater or stormwater runoff.  Most constructed wetlands are planted with hydrophilic (water loving) plants, while others are simply a gravel “filter” media. Both involve biofilms at the water-solid interfaces.

Recent research has now shown that planted CW systems — with their associated biofilms — are significantly more effective in the first weeks and months of treating agricultural processing wastewater.

In greenhouse trials, the planted system removed approximately 80 percent of organic-loading oxygen demand from sugarcane process wastewater after only three weeks of plant growth. The unplanted system removed about 30 percent less.

“Every constructed wetland system has a 'ripening period' during which the biofilm is forming," said Mark Grismer, UC Davis biological engineer. "Ripening means the time it takes for bacteria or other microorganisms to become established and functioning with respect to organics removal. Results indicate this ripening period is shorter in planted CW systems, and can be as short as three weeks if fast-growing aquatic plants are involved in the constructed wetland. In systems without plants, it can continue for two to three years.”

Constructed wetland with plants.

“Plant roots provide the structure needed for biofilm bacteria to process wastewater. Also, because the surface area of plant roots is far greater than that of the sand, gravel, or rock substrate alone, and because roots have the ability to partially oxygenate their surfaces, they can support thicker and perhaps more robust biofilms,” he said.

Studies like this one are providing the field data needed to strengthen efforts to clean up agricultural processing wastewaters.

To read the complete article, go to the April-June edition of California Agriculture journal.

Posted on Wednesday, May 4, 2011 at 9:01 AM
  • Author: Janet L. White
Tags: biofilms (1), wastewater (1), water treatment (1), wetlands (1)

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