In this July 29, 2017 photo, volunteers and installers push into place an array of solar panels on the land of corn farmer Jim Carlson of Silver Creek, Ne., in the proposed path of the Keystone XL pipeline. Despite new uncertainty over whether TransCanada, the builder of the Keystone XL pipeline will continue the project, longtime opponents in Nebraska aren't letting their guard down and neither are law enforcement officials who may have to react to protests if it wins approval. (AP Photo/Nati Harnik)
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