These are formidable numbers but well within the capacity of capital markets if the risk-adjusted returns are available. Indeed in the international climate change negotiations, developed countries have committed to mobilising jointly USD 100 billion per year by 20208 - but key questions remain regarding what financial flows might count towards this commitment and how this will be delivered in practice. For example, it has become more difficult to obtain bank loans with the long maturities required by infrastructure projects as commercial banks face capital and liquidity constraints.