Greenhouse gas emissions intensity is regulated on a facility-by-facility basis. Targets are set at each facility and the facility’s performance over time is compared against its own approved baseline emissions intensity. Emission estimation methodology must be consistent at a given facility in the baseline and compliance period, but methodology varies between facilities depending on facility configuration and data availability. Facilities are required to use the most accurate method for which sufficient data is available, and are required to use conservative estimation methods where uncertainty exists. Since some methods are more conservative than others the total emissions are not necessarily directly comparable between facilities. Each facility also chooses the production metric that most accurately reflects its operation. As such the emissions intensity (emissions per unit production) from facilities with different end products should not be directly compared. In general oil sands facilities produce either raw bitumen or upgrade the bitumen to synthetic crude oil. There is some variability in quality of product even if they use a consistent name.