The transition between federal administrations often brings changes to energy policies, creating uncertainty for businesses and states seeking to reduce greenhouse gas emissions. In this evolving landscape, clean fuel standard policies offer a solution by setting declining carbon intensity targets for fuel producers. States like California, Oregon, and Washington have already implemented such policies, leading to cleaner air, reduced carbon pollution, and economic growth. While these policies can incentivize clean fuel adoption, they need careful design to avoid drawbacks like over-incentivization of biofuels. Customization is key, as states can tailor CFS programs to meet their specific goals and economic realities. By strategically adjusting features like emissions reduction goals and timelines, states can effectively decarbonize their transportation sectors while reaping the benefits of market-driven emissions reductions.