… into an annual implementation cost of $93.7 billion between 2020 and 2030. A closer look at the OECD data for 2013-14 shows that … additional' to development aid, efforts can be further scaled up post-2020. The lion's share of public climate finance goes to wealthier … of mobilising $100 billion in annual international climate finance by 2020, but these efforts must be significantly scaled up now and after …