It’s been less than 48 hours since a panel in Nebraska gave final approval for the Keystone XL pipeline to built in the state, but already more than 8,000 people have vowed to put their bodies on the lines—and in front of the construction path, if needed—to make sure the construction never happens.

“It gives me a great sense of hope and community to see nearly 8,000 people who have signed on to the ‘Promise to Protect’ our water, our homelands, our people, and to stand in solidarity with us on the ground. Especially our Indigenous communities, our tribes, and our farmer and rancher friends. This is hope, this is power—people power.” —Joye Braun, leader of the Wakpa Waste Camp at the Cheyenne River Sioux Reservation

The vow to stand against the pipeline—dubbed the “Promise to Protect”—was launched Monday during a gathering of Indigenous leaders and their allies in South Dakota who renewed their vows to defend sacred lands, waters, and sites against new pipelines and any expansion of the Canadian tar sands. The petition was then endorsed by other Native tribes, green groups, and high-profile climate activists.

Joye Braun, leader of the Wakpa Waste Camp at the Cheyenne River Sioux Reservation in South Dakota, said, “It gives me a great sense of hope and community to see nearly 8,000 people who have signed on to the ‘Promise to Protect’ our water, our homelands, our people, and to stand in solidarity with us on the ground. Especially our Indigenous communities, our tribes, and our farmer and rancher friends. This is hope, this is power—people power.”

Faith Spotted Eagle, member of the Yankton Sioux Nation, said the surge of people commiting to stand against Keystone XL shows the Monday’s decision was not a win for pipeline owner TransCanada.  “Continued attempted assaults on Mother Earth are never winning actions,” she said. “The No KXL Dakota/Lakota gathering at Kul Wicasa on the same day of November 20 is an exciting renewed strong circle of allies who walk forward  stronger than ever. We will prevail in our spiritual movement.”

People can sign the petition as individuals, but entire organizations can also make the commitment.