That was the fundamental question Julia Olson, an attorney and the founder of Our Children’s Trust, posed to Judge Dana Christensen this week during a two-day hearing in a federal courthouse in Missoula, Montana. The case, Lighthiser v. Trump, began in May when 22 young climate activists, aged 7 to 25, filed a lawsuit in the District of Montana asking the court to declare three Trump administration executive orders unconstitutional and prevent their implementation. The lawsuit follows two of OCT’s recent wins, Held v. Montana and Navahine v. Hawaii Department of Transportation, and “further builds American constitutional jurisprudence on fossil fuel activities infringing the fundamental rights of youth,” according to the nonprofit law firm. In other ways, Lighthiser is unlike anything that has come before. For one, this week’s hearing marked the first time a U.S. federal court heard live testimony in a constitutional climate change case.