The Los Angeles City Council has adopted a new policy that will require the city’s vehicles to be converted to alternative fuels. The new clean-fuel regulations call for all 650 trash trucks, plus city transit buses and other fleet vehicles, to be replaced by 2003. The city has about 15,000 trash trucks, buses, and other fleet vehicles that will need to be replaced. Replacement is expected to cost $18 million to $20 million, and trash truck conversion from $68 million to $100 million.