FILE - In this Nov. 16, 2018, file photo, commuters ride a new zero emission electric buses in Porterville, Calif. The California Air Resources Board voted Friday, Dec. 14, 2018, to require that all new buses be carbon-free by 2029. Environmental advocates project that the last dirty buses will phase out by 2040. (Chieko Hara/The Porterville Recorder via AP, FIle)
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