Finally, international development finance is a more traditional channel for mobilising finance, whereby a portion of this can also contribute to biodiversity objectives. They provide a brief overview of the mechanism, including its general purpose and applicability, review the finance that has been mobilised and discusses the extent to which it could be scaled up, and then examine the key design and implementation issues that need to be considered so as to ensure that the mechanism is environmentally effective, economically efficient and distributionally equitable. The range reflects different levels of ambition. The GEF6 Needs Assessment provides a number of estimates that differ according to a) level of ambition b) whether or not incremental reasoning is applied c) level of co-financing (no co-financing, 1:2, 1:4, 1:6) (CBD, 2012a).