This paper outlines a scheme for the financial mobilisation of a ‘Green Fund’ with the capacity to raise resources on a scale proportionate with the Copenhagen Accord (USD 100 billion a year by 2020). It is argued that by providing a unified resource mobilisation framework, with an up-front agreement on burden sharing and the capacity to meet the financing needs identified at Copenhagen, the Green Fund could facilitate progress toward a binding global agreement on reducing greenhouse gas emissions and allow developing countries to begin scaling up their climate change responses.The authors note that to achieve the necessary scale, the Green Fund would use an initial capital injection by developed countries in the form of reserve assets, which could include Special Drawing Rights (SDRs - an international reserve created by the IMF in 1969 to supplement official reserves of its member countries), to leverage resources from private and official investors by issuing low-cost “green bonds” in global capital markets. Resources mobilised by the Green Fund could be channelled through existing climate funds, or via newly created special-purpose disbursement facilities.The authors emphasise that they are not proposing that the IMF itself would create, finance, or manage the Green Fund. Rather, the ideas set out in this paper are being offered purely for consideration by the international community, and as a contribution to the broader public debate.