This paper responds to the request of G20 Finance Ministers in exploring scaled up finance for climate change adaptation and mitigation in developing countries. In so doing it builds upon and extends the work of last year‘s U.N. Secretary-General‘s High Level Advisory Group on Climate Change Financing (AGF). Its starting point is the commitment made in the Copenhagen Accord and Cancun Agreements on the part of developed countries to provide new and additional resources for climate change activities in developing countries. This commitment approaches $30 billion for the period 2010- 12 and $100 billion per year by 2020, drawing on a wide range of resources, public and private, bilateral and multilateral, including innovative sources.