This post is a rather technical note on how we set and interpret climate targets where the underlying data series are subject to frequent revisions. In the EU’s climate architecture, the level of ambition is usually expressed in terms of reduction commitments relative to a base year. Sometimes these reduction commitments are in percentage terms but are then converted into absolute figures using data from the National Inventory Reports for a recent year or period. In other cases, the reduction commitments are already expressed in absolute terms, but the size of the required reduction has previously been determined by reference to national inventories in a base year or period. But what happens to these targets if the data used in these National Inventory Reports are later subject to recalculation?
For example, the Effort Sharing Regulation (EU) 2018/842 as amended by Regulation (EU) 2023/837 has an Annex I which sets out for each Member State the required percentage reduction in covered emissions in 2030 relative to their 2005 levels.… Read the rest
