California isn't just interested in taking fossil fuel cars off the streets -- it wants to clean up buses, too. The state's Air Resources Board has voted to require that all buses are emissions-free by 2040. The transition will start in earnest in 2029, when California will require that all new buses ditch fossil fuels. Transit agencies will have access to subsidies (plus funds from the state's settlement with VW over Dieselgate) to help soften the blow of upgrading their fleets.