
** FILE ** Work has begun on the Keystone XL Pipeline near Winona, Texas, but whether it will ever carry oil sands from central Canada to Gulf Coast refineries awaits a decision by President Obama. (Tyler [Texas] Morning Telegraph via Associated Press)

** FILE ** Work has begun on the Keystone XL Pipeline near Winona, Texas, but whether it will ever carry oil sands from central Canada to Gulf Coast refineries awaits a decision by President Obama. (Tyler [Texas] Morning Telegraph via Associated Press)

** FILE ** Work has begun on the Keystone XL Pipeline near Winona, Texas, but whether it will ever carry oil sands from central Canada to Gulf Coast refineries awaits a decision by President Obama. (Tyler [Texas] Morning Telegraph via Associated Press)

** FILE ** Work has begun on the Keystone XL Pipeline near Winona, Texas, but whether it will ever carry oil sands from central Canada to Gulf Coast refineries awaits a decision by President Obama. (Tyler [Texas] Morning Telegraph via Associated Press)

** FILE ** Work has begun on the Keystone XL Pipeline near Winona, Texas, but whether it will ever carry oil sands from central Canada to Gulf Coast refineries awaits a decision by President Obama. (Tyler [Texas] Morning Telegraph via Associated Press)

**FILE** An irrigation pivot remains along a highway several miles near the proposed new route for the Keystone XL pipeline in Neligh, Neb. (Associated Press)

Work has begun on the Keystone XL Pipeline near Winona, Texas, but whether it will ever carry oil sands from central Canada to Gulf Coast refineries awaits a decision by President Obama. (Tyler [Texas] Morning Telegraph via Associated Press)

** FILE ** Work has begun on the Keystone XL Pipeline near Winona, Texas, but whether it will ever carry oil sands from central Canada to Gulf Coast refineries awaits a decision by President Obama. (Tyler [Texas] Morning Telegraph via Associated Press)

The Sandhills, near Mills, Neb., is an environmentally sensitive area. TransCanada hopes to build the Keystone XL pipeline through the area to transport crude from Canada to the Gulf Coast. The company said Wednesday it has revised the route. (Associated Press)