NEW YORK (Reuters) -California's clean air regulator on Thursday adopted rules to mandate that nearly all trips on Uber's and Lyft's ride-hailing platforms have to be in electric vehicles over the next few years, the first such regulation by a U.S. state. In written comments to the agency ahead of Thursday's vote, Uber and Lyft said they supported the regulation's goals but called for more government to aid their many lower and middle-income drivers with the costs for the transition. That is a lesser goal than the companies themselves have set: both Uber and Lyft last year committed to converting their U.S. fleets entirely to EVs by that year.