What environmentalists can’t achieve in among lawmakers they will resort to the courts.

More than two dozen organizations writing briefs for a pivotal U.S. Supreme Court case on the future of climate change had ties to fossil-fuel linked companies, according to a new report.

Consumer Watchdog, a nonprofit advocacy group based out of California, released a report on Monday drawing connections between 25 organizations that filed amicus briefs to the U.S. Supreme Court ahead of arguments in Suncor v. Boulder County Commissioners.

The case, which challenges whether state and local governments can apply laws to regulate activities that may contribute to climate change, will be heard by justices on the high court Oct. 5.

In 2018 Boulder County and the City of Boulder sued Suncor and ExxonMobil under Colorado tort law, claiming the companies caused climate harms and seeking damages. The defendants argue federal law, not state tort rules, governs liability for greenhouse-gas emissions that cross state and national borders.

A plaintiff win would revive climate suits after recent losses. In Lighthiser v. Trump, a judge dismissed a challenge by 22 young people to Trump energy orders for lack of standing; the Ninth Circuit unanimously affirmed. Maryland’s highest court likewise rejected climate-tort claims by Baltimore, Annapolis, and Anne Arundel County against 26 oil companies, holding that state law cannot impose liability for global emissions.

These cases typically cost defendants tens of millions even without a decisive victory. Ideological funders are using the courts to pursue policy goals—weakening constitutional limits and targeting the U.S. fossil-fuel industry. Amicus briefs from climate groups and advocates, many sharing the same donors, underscore the coordinated effort.

The Supreme Court now has a chance to end it. Here’s hoping they do.