The state's major climate change legislation—commonly referred to as "AB 32"—is approaching a crossroads in its implementation. The state's AB 32 activities, currently carried out mainly by the Air Resources Board (ARB) but also by eleven other state agencies, will be shifting from the development of plans and regulations to program implementation and enforcement. Legislative oversight of the overall size and components of the AB 32 program budget is very important, particularly given this upcoming shift in the program's focus. In this budget-focused brief, we provide details of the Governor's AB 32 budget proposal and ARB's plan to pay for most of the AB 32 program administrative activities from a new fee. We also offer recommendations to ensure that (1) sufficient resources are devoted to economic analysis of AB 32 measures and (2) future AB 32 expenditures and fees are justified and set at appropriate levels.