adcelannotate = {"mobilepaywallcategory" : "MOBILE_PREM-NATIONAL_WORLD","nativepaywallcategory" : "NATIVE_PREM-NATIONAL_WORLD"};WASHINGTON — The fight over the Keystone XL pipeline had all the elements of a classic Washington scrap: protests, political ads and lobbyists on retainer. What was sometimes missing in the seven-year struggle, energy analysts say, was an accurate accounting of the project’s impact on the environment or the economy, the twin issues that drove the debate.