The Effort Sharing Decision covers close to 60% of all greenhouse gas emissions in the EU. It is the EU’s carbon budget for the transport, building and agriculture sectors, among other smaller sectors. It is critical that the 2030 ESD delivers real-world GHG reductions of at least 30%. However, it is equally important to transform the current ESD into an instrument that is “Paris proof”. The review of the 2030 ESD provides a unique opportunity to lay the foundation of a climate governance regime that is robust enough to accommodate the increased ambition the Paris agreement requires. This briefing discusses five new ideas to improve ESD governance.