California’s AB 32 law, passed during Arnold Schwarzenegger’s administration, set the state’s first comprehensive greenhouse‑gas emissions limit. The measure required major polluters to cut emissions to 1990 levels by 2020 and established a market for carbon credits. Since its implementation, the law has driven a measurable decline in emissions and spurred growth in clean‑technology investments. Critics note that reductions have been uneven, with some sectors lagging behind their targets. Governor Gavin Newsom has pledged to extend California’s climate agenda, but he now faces political and economic obstacles that could hinder further progress. The article examines how the AB 32 outcomes shape the hurdles Newsom must address to keep the state’s climate goals on track.