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problem with hydrogen is it cames with worse infrastructure problems, and getting fuel cells out to scale - is there enough catalyst materials in the world, or an alternative catalyst (used to be platinum based). most alternatives work best for centralised distribution, ie buses, lorries, but...

in theory you could make a far more efficient petrol or diesel engine running at continuous rpm to generate electricity. sure still uses fossil fuels but this might be a more practical solution if we accept we dont need to get to 0 emissions to make a meaningful impact.

compulsory solar? thats not going to work so well for those in flats or without the space for enough solar (and battery store), or those of us at higher latitudes or with seasons. its a nice idea in principle, just adds costs to car ownership. we may end up going down this path, with personal...

bio-ethanol fuels are superficially renewable. though some reports suggest lower MPG so may not be net benefit. yeah, they did same with biodiesel and overlooked the impact of tearing down forests to grow palm oil, to fuel european cars. CO2 trumps all considerations though.