What none of these proposals, or Zero emission vehicles, or every other low emission concept seems to consider is that the power has to come from somewhere.. which is, for the greater part of the world, fossil fuels.
Which do you think has more of an impact - burning oil to produce electricity to warm up power lines, to charge batteries to move a truck to push an aeroplane.... with all the attendant losses and inefficiencies all the way down the chain..
Or just burn the oil in the plane/car in the first place?
Perhaps 'they' should concentrate on replacing power generation infrastructure with solar and wind, to reduce environmental impact that way. But then the enviro weenies will complain about the noise, and spoiling the landscape.
Sorry, bordering on a rant, but I'm sure I'm not the only one that thinks there's a real lack of grown up thinking around this sort of thing!