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The article references NREL's Michael Deru and his thoughts on using either a national or regional carbon intensity when calculating a building's carbon footprint instead of local. I have been using local, with the reasoning that when comparing energy usage between office locations, it's educational to understand differences in local energy sources. Currently, I understand there is no one "correct" method for this calculation. I have spoken with several others in this field that have concurred, but would like to know of anyone's arguments for either method.