The 21 youths suing the federal government over climate change have gained a new round of supporters, including 30,000 youths who signed onto a legal brief asking an appeals court to allow the long-delayed case to go to trial.

The “Young People’s Brief” was among 15 new amicus briefs filed Friday by environmentalists, religious and women’s groups, business leaders and eight members of Congress– all in support of the case being tried in court.