Young People Are Suing the Trump Administration Over Climate Change. She’s Their Lawyer.

EUGENE, Ore. — Julia Olson climbed the slope of Spencer Butte, taking the steeper of the two paths. Near the summit, shrouding pines suddenly gave way to a vista of the Cascades. On this day, summer wildfires, their season lengthened by climate change, put a haze in the sky.

The climb and return, which she can power through in an hour, is a head-clearing ritual for Ms. Olson, an environmental attorney. It is also a place to compose the soaring language of opening and closing arguments. “I do my legal thinking here,” she said.

If all goes as planned, Ms. Olson will deliver her opening argument on Monday in a landmark federal lawsuit against the Trump administration on behalf of 21 plaintiffs, ages 11 to 22, who are demanding that the government fight climate change. It is a case that could test whether the judicial branch has major role to play in dealing with global warming, and whether there is a constitutional right to a stable and safe climate.

The young plaintiffs claim that the government’s actions, and inaction, in the face of global warming violate their “fundamental constitutional rights to freedom from deprivation of life, liberty, and property.” Their age is central to their argument: For older Americans, the potentially catastrophic effects of climate change are a problem, but ultimately an abstract one. Today’s children, however, will be dealing with disaster within their lifetimes; the youngest of the plaintiffs, Levi Draheim, will be just 33 in 2040, the year by which a United Nations scientific panel now expects some of the biggest crises to begin.

But as of now, less than a week before the trial is scheduled to start in Federal District Court in Eugene, whether the young people will get their day in court is still an open question. On Friday, Chief Justice John G. Roberts Jr. granted a Trump administration request to put a brief hold on the proceedings to consider government filings that could derail the case.

It is unclear how long the delay will last, or what the outcome will be. The Supreme Court could even dismiss the litigation, though that would be unusual at this early stage.

The lawsuit, Juliana v. United States, is the most visible case for Ms. Olson and her nonprofit organization, Our Children’s Trust. The group is involved in similar legal actions in almost every state, and other climate suits around the world.

Ms. Olson originally filed the federal suit in 2015 against the Obama administration, demanding faster action from a president already seen as friendly to environmental interests. Working under a legal principle known as the public trust doctrine, which can be used to compel the government to preserve natural resources for public use, the initial complaint stated that government officials had “willfully ignored” the dangers of burning fossil fuels.

Then came President Trump, whose administration is reversing Obama-era climate policies and encouraging the use of fossil fuels, which greatly contribute to warming. “In the view of the plaintiffs, Obama was moving too slowly, and now Trump is moving backward,” said Michael B. Gerrard, director of the Sabin Center for Climate Change Law at Columbia Law School.

The young plaintiffs have demanded, among other things, that the courts force the government to “implement an enforceable national remedial plan to phase out fossil fuel emissions” in an effort to “stabilize the climate system.” The courts could then supervise the government’s efforts.

Ms. Olson outside the courthouse on Nov. 10, 2016, holding a copy of Judge Aiken’s decision to reject requests to dismiss the lawsuit.CreditChris Pietsch/The Register-Guard, via Associated Press

The Trump administration’s lawyers are not arguing that climate change is a hoax. Instead, they are making similar arguments to those that the Obama administration made when it, too, tried to dismiss the case: that the young people don’t have standing to sue (a legal formula requiring plaintiffs to show that, among other things, they have suffered a concrete, particular injury because of the actions of the defendant) and that the courts are the wrong place to deal with the issue.

“This lawsuit is an unconstitutional attempt to use a single Oregon court to control the entire nation’s energy and climate policy,” Jeffrey H. Wood, the Justice Department attorney in charge of the division representing the government, said in a statement.

But Judge Ann Aiken, who is scheduled to preside over the trial on Monday, has been receptive to the plaintiffs’ theory of the case. “I have no doubt that the right to a climate system capable of sustaining human life is fundamental to a free and ordered society,” she said in a November 2016 decision allowing the case to go forward.

Since then, the case has rumbled toward trial. In an earlier order in July, the Supreme Court denied a government request to intervene, but wrote that the breadth of the plaintiffs’ claims was “striking,” which could be taken as a note of skepticism about the case’s prospects should it reach the justices.

Trial preparation has been intense at Ms. Olson’s little law firm. Like many law offices, there is a conference room with a long table and computers humming, but there is also chilled kombucha on tap in the kitchen. “I’ve sort of addicted everybody to it,” Ms. Olson said.

Before her sprint up the butte on the day I visited, Ms. Olson had already attended a morning hearing at Eugene’s federal courthouse. Back at the converted 1920s bungalow that houses Our Children’s Trust, she talked with some young plaintiffs who had stayed over from a campground retreat she had held the week before. The subject: what would be expected of them in their depositions.

Philip L. Gregory, another lawyer in the case, described the deposition setup, jumping up and taking positions where the young people would be seated, where their attorney would be, where the questioning attorney would be and where the videographer would be. At that point, he mimicked someone hand-cranking a camera, which got confused giggles from the smartphone generation.

“The most important rule about the deposition is to tell the truth,” Mr. Gregory said. “A deposition is not a test of understanding the law of thermodynamics. It’s not a test on the history of World War II.”

“Or climate change,” Ms. Olson interjected.

“Or climate change,” he agreed.

Legal experts view Ms. Olson’s chances with a measure of ambivalence.

“The claims are compelling, and the legal theory is creative,” said David M. Uhlmann, a law professor at the University of Michigan and a former top Justice Department official on environmental crimes. However, he said, “It is hard to see the Supreme Court upholding a favorable verdict, if the case gets that far.”

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