Nevertheless, these estimates provide an up-to-date aggregate picture of climate finance in relation to the UNFCCC goal based on a transparent accounting framework. We hope that this new information about the volume of mobilised climate finance will be helpful in the context of the international climate negotiations leading up to COP21 in Paris at the end of 2015. Part I outlines the accounting framework for measuring and aggregating climate finance estimates. Part II describes progress towards the USD 100 billion a year by 2020 goal, looking both at estimates of public and private climate finance mobilised.