What are the top legal and practical concerns stemming from a key California climate-change initative, its Advanced Clean Fleets (ACF) rule that went into effect in October 2023? This initiative by the California Air Resources board to move toward mandated zero-emission vehicles for medium- and heavy-duty truck and bus fleets poses many challenges, in particular for High Priority and Federal Fleets. Procopio Energy & Environmental Law attorneys John Lormon and Matt Abbot provide insights in this podcast, the second of a series on ACF.