Pennsylvania Gov. Tom Wolf (Office of Gov. Tom Wolf)HARRISBURG - Gov. Tom Wolf’s administration has begun drafting a regulation that would require automakers to offer electric cars for sale in Pennsylvania as a way to cut emissions of greenhouse gases and pollutants that cause lung problems, it said Friday.At least 12 states already have a requirement for the zero-emission electric vehicles, including neighbors Maryland, New Jersey and New York.Drafting a regulation and shepherding it through the approval process often takes a year or more.The rule would help ensure that automakers offer new zero emissions electric vehicle models for sale in Pennsylvania, the Department of Environmental Protection said.