Dozens of world leaders will be meeting at the United Nations Food and Agriculture Organization headquarters in Rome starting Tuesday to address a global food crisis caused part by water shortages in Africa, Australia and here in southern Spain.

    Climate change means that creeping deserts may eventually drive 135 million people off their land, the Spain estimates. Most of them are in the developing world. But southern Europe is experiencing the problem now, its climate drying to the point that it is becoming more like Africa's, scientists say.

    For Murcia, the water crisis has come already. And its arrival has been accelerated by developers and farmers who have hewed to water-hungry ventures highly unsuited to a drier, warmer climate: crops like lettuce that need ample irrigation; resorts that promise a swimming pool in the backyard; acres of freshly sodded golf courses that sop up millions of gallons a day.

    "I come under a lot of pressure to release water from farmers and also from developers," said Antonio Pérez Gracia, the water manager for Fortuna, sipping coffee with farmers in a bar in the town's dusty square on a recent morning. He rued the fact that he could provide each property owner with only 30 percent of its government-determined water allotment.

    "I'm not sure what we'll do this summer," he added, noting that the local aquifer was sinking so quickly that the pumps would not reach it soon. "I come under a lot of pressure to release water, from farmers and also from developers. They can complain as much as they want, but if there's no more water, there's no more water."

    Rubén Vives, a farmer who relies on Mr. Pérez Gracia's largess, said he could not afford the current black market water prices. "This year, my livelihood is in danger," said Mr. Vives, who has farmed low-water crops like lemons here for nearly two decades.

    The hundreds of thousands of wells - most of them illegal - that have in the past provided a temporary reprieve from thirst have depleted underground water to the point of no return. Water from northern Spain that was once transferred here has also slowed to a trickle, as wetter northern provinces are drying up, too.

    The scramble for water has set off scandals. Local officials are in prison for taking payoffs to grant building permits in places where there is not adequate water. Chema Gil, a journalist who exposed one such scheme, has been subject to death threats, carries pepper spray and is guarded day and night be the Guardia Civil, a police force with military and civilian functions.

    "The model of Murcia is completely unsustainable," said Mr. Gil. "We consume two and a half times more water than the system can recover. So where do you get it? Import it from elsewhere? Dry up the aquifer? With climate change we're heading into a cul-de-sac. All the water we're using to water lettuce and golf courses will be needed just to drink."

    Facing a national crisis, Spain has become something of an unwitting laboratory, sponsoring a European conference on water issues this summer and this year announcing a national action plan to fight desertification. That plan includes a shift to more efficient methods of irrigation, as well as an extensive program of desalinization plants to provide the fresh water that nature does not.

    The Spanish Environment Ministry estimates that one-third of the county is at risk of turning into desert from a combination of climate change and poor land use.

    Still, national officials visibly stiffen when asked about the "Africanization" of Spain's climate - a term now common among scientists.

    "We are in much better shape than Africa, but within the E.U. our situation is serious," said Antonio Serrano Rodríguez, the secretary general for land and biodiversity at Spain's Environment Ministry.

    Still, Mr. Serrano and others acknowledge the broad outlines of the problem. "There will be places that can't be farmed any more, that were marginal and are now useless," Mr. Serrano said. "We have parts of the country that are close to the limit."

    While southern Spain has always been dry and plagued by cyclical droughts, the average surface temperature in Spain has risen 2.7 degrees compared to about 1.4 degrees globally since 1880, records show.

    Rainfall here is predicted to fall 20 percent from this year to 2020, and 40 percent by 2070, according to United Nations projections.

    The changes on the Almarcha family farm in Albanilla over the past three decades are a testament to that hotter, drier climate here. Until two decades ago, the farm grew wheat and barley, watered only by rain. As rainfall dropped, Carlo Almarcha, 51, switched to growing almonds.

    About 10 years ago, he quit almonds and changed to organic peaches and pears, "since they need less water," he explained. Recently he took up olives and figs, "which resist drought and are less sensitive to weather."

    Mr. Almarcha participates in a government water trading system, started last year, in which farmers pay three times the normal price - 33 cents instead of 12 per cubic meter - to get extra water. The black market rate is even higher. Still, his outlook is bleak.

    "You used to know that this week in spring there will be rain," he said, his work boots standing on parched soil of an olive grove that was once a wheat field. "Now you never know when or if it will come. Also, there's no winter any more and plants need cold to rest. So there's less growth. Sometimes none. Even plants all seem confused."

    While Mr. Almarcha has gradually moved toward less thirsty crops, the government's previous water transfer plans have moved many farmers in the opposite direction. The farmers have shifted to producing a wide range of water-hungry fruits and vegetables that had never been grown in the south. Murcia is traditionally known for figs and date palms.

    "You can't grow strawberries naturally in Huelva - its too hot," said Raquel Montón, a climate specialist at Greenpeace in Madrid, referring to the nearby strawberry capital of Spain. "In Sarragosa, which is a desert, we grow corn, the most water thirsty crop. It's insane. The only thing that would be more insane is putting up casinos and golf courses." Which, of course, Murcia has.

    In 2001, a new land use law in Murcia made it far easier for residents to sell land for resort development. Though southern Spain has long had elaborate systems for managing its relatively scarce water, today everyone, it seems, has found ways to get around them.

    Grass on golf courses or surrounding villas is sometimes labeled a "crop," making owners eligible for water that would not be allocated to keep leisure space green. Foreign investors plant a few trees and call their holiday homes "farms" so they are eligible for irrigation water, Mr. Pérez Gracia said.

    "Once a property owner's got a water allotment, he asks for a change of land use," he explained. "Then he's got his property and he's got his water. It's supposed to be for irrigation, but people use it for what they want. No one knows if it goes to a swimming pool."

    While he said his "heart goes out to the real farmers," he does not have the personnel to monitor how people use their allotments.

    With so much money to be made, officials set aside laws and policies that might encourage sustainable development, Mr. Gil, the journalist, said. At first, he was vilified in the community when he wrote articles critical of the developments. Recently, as people are discovering that the water is running out, the attitude is shifting.

    But even so, people and politicians tend to regard water as a limitless resource. "Politicians think in four-year blocks, so it's O.K. as long as it doesn't run out on their watch," Ms. Montón of Greenpeace said. "People think about it, but they don't really think about what happens tomorrow. They don't worry until they turn on the tap and nothing flows."

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