As production-based emissions accounting is currently favoured in policy terms, its methodology is well established. Emissions are calculated not directly but indirectly from fossil fuel usage and other relevant processes such as industry and agriculture according to 2006 guidelines issued by the IPCC for GHG reporting. The guidelines span numerous methodologies dependent on the level of sophistication (Tiers 1–3 in Table 2).
Production-based emissions accounting is currently favored in policy terms, its methodology is well established. Emissions are calculated indirectly from fossil fuel usage and other relevant processes like industry and agriculture according to guidelines issued by the IPCC for greenhouse gas reporting in 2006. These guidelines include various methodologies depending on the level of detail (Tiers 1–3 in Table 2).