Decarbonising the world‟s energy system to avoid locking-in polluting technologies and unacceptably high emission levels will require doubling existing investment levels to around USD 2 trillion a year or 2% of GDP. Governments understand that large sums of capital will be required, and many are also realising the need for further recourse to private capital as public finances have become strained in many developed countries. Simultaneously, banking sector provision of long-term finance has become tighter due deleveraging and new financial regulations. With their USD 71 trillion in assets, institutional investors potentially have an important role to play. Given the.