A federal environmental lawsuit in Oregon has pitted Sidley Austin against an unusual foe—a coalition of children and teens pressing the Obama administration to do more to address climate change.

Representing a trio of industry associations, a Sidley team moved last week to intervene in the Oregon case and asked a judge to dismiss it. The suit was lodged in August by a group of individual teens and even younger plaintiffs—one of them just 8t years old—along with the nonprofit organization Earth Guardians and the climate scientist James Hansen.