Two members of the Sisters of Mercy of the Americas joined more than 500 ministers and religious leaders on November 4 for a day of prayer and conversation in south central North Dakota to confront what they contend is an ecological disaster waiting to happen.

When Sisters Aine O'Connor and Kathleen Erickson heard a call for a peaceful and prayerful presence on the front line of a campaign to protect sacred Sioux lands in North Dakota from a multibillion-dollar oil pipeline project, they knew they had to respond.