A treehouse inhabited by protesters is seen near Berkeley's Campanile tower near the University of California campus. University officials are trying to decide how best to remove the tree-sitters so that a grove can be cleared for a new sports facility.

Berkeley, Calif. ? University of California officials have won the legal right to oust a band of tree-sitters who’ve taken up residence in an oak grove standing in the way of a planned sports center.

But how do you uproot a tree-sitter in Berkeley, one of America’s most politically correct cities?

“Extremely difficult,” acknowledges campus spokesman Dan Mogulof.

As the protest nears its one-year anniversary, plenty of people have suggestions: Fire hoses, skunk spray and tranquilizer darts are among the thorny ideas Internet posters have planted.

So far, the university has moved cautiously.

The university wants to remove dozens of the picturesque trees, called evergreen coast live oaks, to build a $125 million training facility for its Golden Bears athletic teams.

There have been scuffles between police and tree-sitters; and campus officials have put up chain-link fences around the grove. University lawyers have told a judge they are considering pruning lower branches – to make it harder to ferry supplies up to the protesters.

Both sides say they don’t want a treetop confrontation.

“It’s not an easy thing to do, to climb up into a tree, first of all,” said Doug Buckwald, member of a group that supports tree-sitters but doesn’t join them. “If you’re climbing up into a tree to try to wrestle with somebody and drag them down, you are taking on a high level of risk.”

A judge ruled last month that school officials would be within their rights to oust the protesters. Mogulof declined to comment on what tactics campus police might use but said they are “not currently contemplating a forcible removal.”

“Any decisions we make are going to be guided by an overriding desire to minimize the chance of harm coming to our officers or the people in the trees,” Mogulof said.

The protest began last Dec. 2. It’s unclear exactly how many tree-sitters there are, or whether they are students or outsiders. Many rotate in and out at night and wear masks, and they usually give false names.

Although some just spend a few hours in a tree to show solidarity, others seem to hang out for days or weeks, helped by supporters who hoist food, water and reading materials to them in buckets and haul out trash, excrement and other waste.

Notable milestones have included an appearance by conservationist Sylvia McLaughlin, 91, who briefly sat on a tree platform in January. There have been two nude photo shoots, and two sitters have fallen, breaking bones.

The next big development in the case could be a ruling, expected soon, on lawsuits filed by the city of Berkeley and others challenging the building plans. They argue the athletic center would be environmentally and seismically unsound, which campus officials deny.

The judge hearing those lawsuits previously issued an injunction banning construction while the case is pending.

Campus officials say a new gym will allow the school to move athletes out of cramped and dilapidated quarters in Cal’s 84-year-old Memorial Stadium. They promise to plant three new trees for every one felled.

Sitters have vowed not to descend as long as the oaks are in peril. The sound of laughter and guitar music wafted from the trees as sitters enjoyed mild temperatures on a golden afternoon this week.

The group was feeling “awesome,” said a sitter who would give only her nickname of “Dumpster Muffin.” Still, she said, they are concerned for their safety. “It’s definitely coming to a head of some sort.”