Keystone XL Pipeline Clears Last Major Hurdle Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email May 24, 2012: Some of about 500 miles worth of coated steel pipe manufactured by Welspun Pipes, Inc., originally for the Keystone oil pipeline, is stored in Little Rock, Ark. ( Danny Johnston / Associated Press ) Hosted by Todd Zwillich Produced by PRI and WNYC