When it becomes cheap to create Hydrogen Gas without using too much energy to produce it, I'd stick with Electric Cars.
While the battery components are toxic, it doesn't necessarily go BOOM does it?
As for Steampunk...yeah, Either it uses modern components or fuel, or we'll use more Wood and coal for fuel (Which we do but lolz)
As for phones...They're not phones anymore are they? They're MP3's, Mini PDA's and a Web Browser all in one now. :/ I just can't imagine a time without one lol. (Actually I do but lulz)