High-stakes climate litigation being pursued across the country and worldwide, purportedly on behalf of children, can be traced to a single, left-wing public interest law firm with big-money backing and ties to longtime progressive activists, Fox News Digital has learned.

The Oregon-based firm Our Children’s Trust (OCT), which is classified as a 501(c)(3) public charity, was established more than a decade ago to provide youth with legal services “to secure their legal rights to a safe climate.” Since its founding, OCT has filed multiple federal lawsuits, spearheaded legal actions in all 50 states and is even involved in litigation in Canada, Mexico, Pakistan, India and Uganda.

“These young people are doing exactly what they’ve been taught by elders — when they see a wrong, they take steps to right it,” Mat dos Santos, OCT’s co-executive director and general counsel, said last week.

Dos Santos, who is tasked with overseeing OCT’s legal program, made the comments during a rally outside the White House where activists called for President Biden to take their side in Juliana v. United States, one of several cases the group is pursuing. According to OCT, the plaintiffs in the case are 21 young Americans who are concerned the government has violated their constitutional rights to life, liberty and property.

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OCT filed its complaint in Juliana v. United States in 2015, arguing that the federal government has contributed to global warming for decades, despite being well aware of the cataclysmic impacts of climate change. The lawsuit — which is currently making its way through the U.S. Ninth Circuit Court of Appeals — takes aim at policies allowing fossil fuel extraction, transportation and combustion.

Days before the White House rally, Sen. Ed Markey, D-Mass., one of the original architects of the Green New Deal, released a podcast with dos Santos and some of the plaintiffs in the case. In the episode, the senior lawmaker lauded the children for “fighting against what preceding generations have done to pollute and to create this problem.”

The group’s growing suite of climate litigation, meanwhile, broadly follows the same format, asserting on behalf of a handful of youth that federal or state agencies are harming their future by allowing fossil fuel reliance. 

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OCT’s most recent lawsuit was filed in December against the Environmental Protection Agency, and its most successful case so far has been Held v. State of Montana, which yielded a favorable judgment last year. The First Judicial District Court of Montana’s ruling, which has since been appealed by the state, struck down certain state laws promoting fossil fuels and concluded youth plaintiffs were harmed by said laws.

“Today, for the first time in U.S. history, a court ruled on the merits of a case that the government violated the constitutional rights of children through laws and actions that promote fossil fuels, ignore climate change, and disproportionately imperil young people,” Julia Olson, OCT’s chief legal counsel and co-executive director, said after the ruling in August 2023.

But, according to a Fox News Digital review of financial filings, career databases and recruitment documents, OCT has attracted the financial backing of major left-wing philanthropic nonprofits and is led by longtime activists. In its 2023 impact report, the group stated it receives pro bono legal support from people affiliated with Earthjustice and Oxfam America, two massive groups involved in climate lawsuits.

OCT also actively recruits children between the ages of 8 and 18 years old to serve as the face of their legal efforts. Children interested in serving as plaintiffs in OCT’s cases are directed to an online interest form, which asks applicants for a wide range of contact information, including their pronouns, and how climate change has impacted them personally.

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“Our Children’s Trust exploits well-intentioned kids, using them as political cover to achieve its goal of shutting down responsible energy development in Montana and around the nation,” said Chase Scheuer, a spokesperson for Montana Attorney General Austin Knudsen. Knudsen has taken the lead in defending his state’s energy policies in Held v. State of Montana.

“Unable to implement policies through the normal processes of representative government, they are trying to override the will of the people and use the courts to impose their extremist climate agenda,” Scheuer continued.

Overall, OCT reports having more than $5.4 million in net assets and received $2.2 million in financial contributions in 2022 and $3.2 million in contributions a year prior, according to its tax forms. While the group’s donors are hidden from public view, a review of various liberal nonprofits’ tax forms shows the group routinely receives large grants.

For example, in 2022, it received $200,000 from the Amalgamated Charitable Foundation; $100,000 from the Alex C. Walker Foundation; $100,000 from Impact Assets; and donations worth $50,000 from the Jacob & Terese Hershey Foundation and Park Foundation, among others. Those grantmaking nonprofits generally contribute to progressive social and environmental causes.

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The Amalgamated Foundation, OCT’s apparent largest financier, is the charitable arm of Amalgamated Bank, an operation focused on progressive issues and which is majority-owned and controlled by Workers United, a division of the massive labor union Service Employees International Union (SEIU). 

Under the leadership of its executive director Anna Fink, the Amalgamated Foundation spearheaded a campaign after the Jan. 6, 2021, Capitol riot to pressure organizations to divert donations for Republicans to the Amalgamated Foundation instead. That program received backing from George Soros’ Open Society Foundation.

In addition, dos Santos and Olson, OCT’s co-executive directors, have a long history of progressive activism. 

Dos Santos remains on the boards of the Transgender Law Center, Latino Network and the Chosen Family Law Center. He also previously served as legal director of the ACLU’s Oregon chapter, where he advocated for LGBT rights, immigrants and criminal justice reform. Dos Santos notably led a challenge against former President Donald Trump’s immigration actions and represented a transgender inmate demanding the state provide hormone therapy.

And Olson previously served as an attorney at Earthjustice before beginning her own firm, Wild Earth Advocates.

Other staff and members of OCT’s board of directors have ties to climate-focused organizations such as the Women’s Environmental and Development Organization, Western Environmental Law Center, Food & Water Watch and Columbia University’s Earth Institute.

OCT and the Amalgamated Charitable Foundation didn’t respond to requests for comment.