Mercy Sr. Aine O'Connor, Marianne Comfort, justice coordinator for the Mercy Sisters, and Mercy Sr. Rita Parks, all from Silver Spring, Md., hold aloft signs Sept. 20, 2019, in front of St. Patrick's Church in Washington as they prepare to join the climate change march. The Washington rally was one of several taking place across the country and in England and Australia. (CNS/Carol Zimmermann)