BBC: American 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.
The huge facility on the Gulf of Mexico was originally designed to import natural gas to the US.
But within two years of opening, the owners decided to reverse the process.
In that time, American shale gas has become abundant and relatively cheap.
One of the first contracts will see shale gas shipped to...