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

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Los Angeles -- California is defined by its scenery, from the mountains that enchanted John Muir to the wine country and beaches that define its culture around the world.

But as scientists try to forecast how global warming might affect the United States' most geographically diverse state, they envision a landscape that could look quite different by the end of this century, if not sooner.

Where celebrities, surfers and wannabes mingle on Malibu's world-famous beaches, there may be only sea walls defending fading mansions from the encroaching Pacific. In Northern California, tourists could have to drive farther north or to the cool edge of the Pacific to find what is left of the region's signature wine country.

Abandoned ski lifts might dangle above snowless trails more suitable for mountain biking even during much of the winter. In the deserts, Joshua trees that once extended their tangled, shaggy arms into the sky by the thousands may have all but disappeared.

"We need to be attentive to the fact that changes are going to occur, whether it's sea level rising or increased temperatures, droughts and potentially increased fires," said Lisa Sloan, a scientist who directs the Climate Change and Impacts Laboratory at the University of California, Santa Cruz. "These things are going to be happening."

Among the earliest and most noticeable casualties is expected to be California's ski season.

Snow is expected to fall for a shorter period and melt more quickly. That could shorten the ski season by a month even in wetter areas and perhaps end it in others.

Whether from short-term drought or long-term changes, the ski season already has begun to shrivel in Southern California, ringed by mountain ranges that cradle several winter resorts.

"There's always plenty of snow, but you may just have to go out of state for it," said Rinda Wohlwend, 62, who belongs to two ski clubs in Southern California. "I'm a very avid tennis player, so I'd probably play more tennis."

Because California has myriad microclimates, covering an area a third larger than Italy, predicting what will happen by the end of the century is a challenge.

A natural gas-fired power generation plant is seen in Burbank, California August 31, 2006. California on Thursday set key emissions targets and became the first state to require heavy industries to report their greenhouse gases, major steps in its landmark law to reduce global warming. [Agencies]

But through a series of interviews with scientists who are studying the phenomenon, a general description of the state's future emerges.

By the end of the century, temperatures are predicted to increase by 3 to 10 degrees Fahrenheit statewide. That could translate into even less rainfall across the southern half of the state, already under pressure from the increased frequency of wildfires and relentless population growth.

Small mammals, reptiles and colonies of wildflowers in the deserts east of Los Angeles are accustomed to periodic three-year dry spells. But they might not be able to withstand the 10-year drought cycles that could become commonplace as the planet warms.

Scientists already are considering relocating Joshua tree seedlings to areas where the plants, a hallmark of the high desert and namesake of a national park, might survive climate change.

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