At the international level, it can help to build trust that developed countries are delivering on their climate finance commitments and so facilitate more ambitious climate action by developing countries over time. In particular, as outlined in previous CCXG and other analyses, there are significant methodological challenges in estimating mobilised climate finance (Caruso and Ellis, 2013, Jachnik, Caruso and Srivastava, 2015), including assessing causality between a public intervention and mobilised private climate finance. Further, current climate finance reporting requirements under the UNFCCC contain inconsistencies and gaps (Ellis and Moarif, 2015). In addition, there can be significant capacity and institutional challenges relating to collecting and reporting information on climate finance received.