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Stacks of pipe are stored at the pipe yard for the Houston Lateral Project, a component of the Keystone pipeline system in Houston.
Stacks of pipe are stored at the pipe yard for the Houston Lateral Project, a component of the Keystone pipeline system in Houston.
(RICK WILKING/REUTERS)

DAVID SHRIBMAN

As the U.S. approaches energy independence, larger questions loom

These all occurred last week: The United States Senate killed an energy-efficiency bill that had broad bipartisan support in part because of a fight over the Keystone XL pipeline. The Obama administration said it was considering ending a nearly four-decades-old ban on exporting crude oil. And, as Pennsylvania girded for a bruising gubernatorial primary election Tuesday, Democratic candidates pressed for new taxes on the state’s growing energy sector and the Pennsylvania Independent Oil & Gas Association warned that a severance tax would endanger the state’s new engine of economic growth.