lives, accordingd to the ukrainian government. irika. >> sargent: holly williams, thank you. an historic, ambitious declaration from the c.e.o. of general motors tonight, the auto giant making plans to spend $35 billion on electric vehicles over the next four years in a quest to overtake tesla as the e.v. world leader. cbs' ben tracy spoke with g.m.'s mary barra about her road to an electric future. >> we want to lead in e.v.s, full stop. so that's where we're aggressively moving. >> reporter: we met up with mary barra at factory zero, g.m.'s first assembly plant for zero emissions electric vehicles. this is where they make the electric hummer. so the hummer is no longer a gas guzzler. >> not at aut a huge truck that costs more than $100,000 is not what most americans want or can afford. so g.m. is now spending $4 billion to overhaul its plant in orion, michigan, to start making