(Agencies)
Updated: 2007-12-30 11:37

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"Obviously, it's going to mean that choices are going to be made about who's going to get the water," said Brian Nowicki, a biologist with the Center for Biological Diversity in Tucson, Ariz.

Among the biggest unknowns is what will happen along California's coast as the world's ice sheets and glaciers melt. One scenario suggests the sea level could rise by more than 20 feet.

Will the rising sea swamp the ports of Long Beach and Los Angeles, the nation's busiest harbor complex, turning them into a series of saltwater lakes? Will funky Ocean Beach, an island of liberalism in conservative San Diego County, become, literally, its own island?

Among the more sobering projections is what is in store for marine life.

The upwelling season, the time when nutrient-rich water is brought from the ocean's depths to the surface, nourishes one of the world's richest marine environments.

That period, from late spring until early fall, is expected to become weaker earlier in the season and more intense later. Upwelling along the Southern California coast will become weaker overall.

As a result, sea lions, blue whales and other marine mammals that follow these systems up and down the coast are expected to decline.

The changing sea will present trouble for much of the state's land-dwelling population, too. A sea level rise of 3 to 6 feet would inundate the airports in San Francisco and Oakland. Many of the state's beaches would shrink.

"If you raise sea level by a foot, you push a cliff back 100 feet," said Jeff Severinghaus, professor of geosciences at the Scripps Institution of Oceanography in San Diego. "There will be a lot of houses that will fall into the ocean."

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