In order to minimize the negative economic impact of cap-and-trade, it is important that auction revenues be invested in a way that maximizes GHG emission reductions for a given level of spending. In reviewing the Governor's proposed expenditure plan, we find that there is significant uncertainty regarding the degree to which each investment proposed for funding will achieve GHG reductions. This uncertainty is the result of several factors, including there being only limited data and analysis provided by the administration, as well as the fact that the level of emission reductions achieved would depend on the specific projects funded by departments. Given these concerns, we recommend that the Legislature direct ARB to develop metrics for departments to use in order to prospectively evaluate the potential GHG emission benefits of proposed projects, as well as direct the board to establish a set of guidelines for how departments should incorporate these metrics into their decision making processes.