Grist: Supporters of the Keystone XL pipeline cheered Tuesdays release of a study that deemed diluted bitumen - the heavy crude mined in Albertas tar sands that Keystone would carry to Texas - just as safe to transport via pipeline as other forms of crude oil. They see the results as further clearing the way for approval of the pipeline.
But environmental groups criticized the methodology and limited scope of the study, which was conducted by the National Academy of Sciences. From Inside Climate News:...