WASHINGTON — The Rev. Lennox Yearwood punched his fist in the air as he rhythmically boomed into the microphone: “This is a moment for great leadership. This is a moment for our country to stand up. This is our moment.”

But Mr. Yearwood’s audience was not a church. It was the Environmental Protection Agency...

“The science is clear,” said Lisa Sharon Harper, the senior director of mobilizing for Sojourners, an evangelical organization with a social justice focus. “The calls of city governments — who are trying to create sustainable environments for 25, 50 years — that’s clear.”

Ms. Harper was one of about 20 interfaith activists who quietly sang “Hallelujah” and Jewish spirituals in a prayer circle outside the environmental agency’s 12th Street entrance here on Tuesday. Mr. Yearwood and three other faith leaders spoke at the hearings on Tuesday, and about 20 others did on Wednesday.