This report does not propose to enter the discussions on financing and investment levels that will be needed to support green growth such as is done by the IEA (2010a) for the energy sector, but rather will look at where required flows may come from and how financial instruments such as green bonds might be used to shift flows to support green growth. However, for illustrative purposes it is useful to examine the ranges of estimates that are quoted. Smil (2010b) suggests that the scale of the envisaged global transition to non-fossil fuels is immense, approximately 20 times larger than.
