Washington Wire: Ever since President Barack Obama in June made (in a rather a Delphic fashion) climate change the key condition for approval of the Keystone XL pipeline, the arguments over the project have shifted from job creation and groundwater pollution to focus on greenhouse-gas emissions. Fresh analysis out from energy consultancy IHS Cera says the pipeline, which would carry Canadian tar sands crude from Alberta to Nebraska and eventually to the U.S. Gulf Coast, will not have any impact on GHG emissions....