What are the pros and cons of the proposed Keystone pipeline?

About half of the system is already built, including a pipeline that runs east from Alberta and south through North Dakota, South Dakota and Nebraska. The State Department is now reviewing a proposed 1,179-mile addition to the pipeline, the Keystone XL, a shortcut that would start in Hardisty, Alberta, and diagonally bisect Montana, South Dakota and Nebraska. read more

The proposed Phase IV, Keystone XL, would begin in Alberta and extend to Steele City, Neb., essentially replacing phase I of the existing pipeline with a more direct route. The project has been politically fraught, with debate over the pipeline now entering its sixth year. read more