Article Photos: Southern Keystone XL segment crosses halfway mark

Crews work Feb. 4 on a section of the Keystone Pipeline where a woman locked herself to the pipeline in protest to protect Oklahoma waterways from Tar Sands. Photo by Chris Landsberger, The Oklahoman <strong>CHRIS LANDSBERGER - CHRIS LANDSBERGER</strong>

Crews work Feb. 4 on a section of the Keystone Pipeline where a woman locked herself to the pipeline in protest to protect Oklahoma waterways from Tar Sands. Photo by Chris Landsberger, The Oklahoman CHRIS LANDSBERGER - CHRIS LANDSBERGER