Several of the economic instruments, like energy taxes, have fund raising properties the revenues of which could be channelled back or “recycled” into funds for climate-related activities. Regarding the latter, national governments could decide to voluntarily make available funds in relation to their own GDP (a voluntary “GDP tax”), or there could be GDP-related transfers based on an internationally agreed rate (analogous to ODA commitments), or there could be a multilateral collection of such “GDP taxes”. In terms of intertemporal reallocation, a dedicated international financing facility could stimulate front-loaded investments in mitigation.