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The need for a diversity of fuel sources, and the neglect of biofuel feedstocks, are two reasons that make me agnostic about any prediction of an end of the ICE. Sure we could go fossil fuel-free, but not fuel-free at all. Well, even if we consider the last iteration of the ICE to be a microturbine (which by the way is more fuel-agnostic than most of the reciprocating engines) powering a "range extender" for an EV, turning it basically into a serial hybrid, it may be actually even more beneficial regarding the environmental impact, since it would allow the usage of certain raw materials as feedstock for biofuels instead of leaving them simply rot away releasing compounds which in the end may become more harmful.
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