US gas produced by 'fracking' to be exported for the first time
16 July 2013 Last updated at 20:14 BST
US gas produced by the controversial technique of "fracking" is due to be exported for the first time.
A $20bn project to prepare an export terminal is under way in Louisiana.
One of the first contracts will see shale gas shipped to Britain under a contract with Centrica.
David Shukman reports.