Keystone saga continues: Firm sues govt., seeks damages under NAFTA
TransCanada, Keystone XL's sponsor, sued in federal court in Houston to overturn the federal rejection of the pipeline project.
Nurses union cheers Obama Keystone veto threat
Keystone foes say the pipeline would carry "dirty oil" to the U.S. Gulf Coast refineries at a cost of an unacceptable increase in the gases that cause global warming.
