Pipeline would threaten aquifer that irrigates much of central U.S.

http://www.washingtonpost.com/national/health-science/keystone-xl-pipeline-may-threaten-aquifer-that-irrigates-much-of-the-central-us/2012/08/06/7bf0215c-d4db-11e1-a9e3-c5249ea531ca_story.html

http://www.washingtonpost.com/blogs/keystone-down-the-line/

Keystone XL would cross the Ogallala Aquifer, a huge underground source of fresh water. How safe is that?