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The Los Angeles Times (March 12, 2009, Margot Roosevelt reporting)

The initial results of the Governor's project to inform coastal areas about potential vulnerability to sea-level rise are beginning to arrive.

Here is an excerpt from the LA Times article:

"California's interagency Climate Action Team on Wednesday issued the first of 40 reports on impacts and adaptation, outlining what the state's residents must do to deal with the floods, erosion and other effects expected from rising sea levels.

Hundreds of thousands of people and billions of dollars of Golden State infrastructure and property would be at risk if ocean levels rose 55 inches by the end of the century, as computer models suggest, according to the report.

The group floated several radical proposals: limit coastal development in areas at risk from sea rise; consider phased abandonment of certain areas; halt federally subsidized insurance for property likely to be inundated; and require coastal structures to be built to adapt to climate change.

"Immediate action is needed," said Linda Adams, secretary for environmental protection. "It will cost significantly less to combat climate change than it will to maintain a business-as-usual approach."

Few topics are likely to be more contentious than coastal development. But along the state's 2,000-mile shoreline the effects would be acute, particularly in San Mateo and Orange counties, where more than 100,000 people would be affected, according to the 99-page state-commissioned report by the Oakland-based Pacific Institute.

Detailed maps of the coastline, published on the institute's website, show that residential neighborhoods in Venice and Marina del Rey could find themselves in a flood zone. Water could cover airports in San Francisco and Oakland, parts of the ports of Los Angeles and Long Beach, and large swaths of Huntington Beach and Newport Beach.

Roads, schools, hospitals, sewage plants and power plants may have to be relocated. More than 330 hazardous waste sites are at risk from floods.

"The rising sea level could be California's version of Hurricane Katrina," said Michael Woo, a Los Angeles planning commissioner and urban planning professor at USC. "Taxpayers and insurance ratepayers might question their responsibility to help homeowners and businesses which knowingly build in high-risk coastal areas."

California's far-reaching adaptation initiative reflects an emerging global consensus: Scientists can argue over how fast the Earth is heating up and diplomats can wrangle over emissions caps, but politicians must begin planning for the certainty of climate change.

Dozens of world-class scientists and economists, many from the University of California and state research institutes, are examining potential effects of warming on snowpacks, wildfires, crops and electricity demand.

Further reports will examine climate effects on hospital admissions, mortality rates, pollution and the habitats of the state's animals and plants. Dutch experts have been consulted on how to armor the coast with improved dikes and sea walls -- controversial measures that some experts contend will only increase erosion.

Detailed studies, now undergoing peer review, are to be released over the next month. Then the Climate Action Team is to send a comprehensive report to Gov. Arnold Schwarzenegger.

Sea levels along California have risen an average of about 8 inches in the past century. According to the Pacific Institute report, 260,000 Californians already live in flood zones, but are assumed to be protected by existing levees and sea walls. A rise of 1.4 meters (55 inches) would increase the population at risk to 480,000. Currently, 1,900 miles of roads and highways are at risk of flooding, which would grow to 3,500 miles under the sea level rise projections.

The report estimated that one adaptation strategy, armoring the coast with 1,100 miles of new or modified sea walls and levees, would cost at least $14 billion to construct, and another $1.4 billion a year to maintain."

You can read the whole article here:

California panel urges 'immediate action' to protect against rising sea levels