YouthvGov press conference at U.S. Supreme Court

The Our Children's Trust team of plaintiffs is led by Kelsey Juliana during a press conference on the steps of the Supreme Court in Washington, D.C., on  Thursday, April 27, 2017. The youth are suing the United States government on constitutional grounds over climate change.

Levi is the youngest of the 21 plaintiffs. He had a great time playing under a colorful parachute on the sidewalk in front of the Supreme Court.

Plaintiffs Levi, center, and Jacob, right, enjoy the parachute.

Youth plaintiff JOURNEY ZEPHIER and attorney PHILIP GREGORY stand on the steps of the Supreme Court.

Plaintiffs Xiuhtezcatl Martinez and Victoria Barrett on the steps of the courthouse.

Our Children's Trust lead attorney Julia Olson and plaintiff Kelsey Juliana outside the Supreme Court.

Julia Olson looks over her notes before the start of the press conference.

Best friends Isaac and Zealand on the steps of the courthouse.

Sen. RON WYDEN (D-OR) gives a high-five to youth plaintiff LEVI DREHEIM during a press conference on the sidewalk in front of the United States Supreme Court in Washington. 

Plaintiff Xiuhtezcatl Martinez is interviewed after the press conference.

Youth plaintiffs, from left,  ISAAC VERGUN, AJI PIPER, and KIRAN OOMMEN sit on the steps of the Supreme Court in Washington, D.C.