Comment Re:With the best will in the world... (Score 1) 486
In order for it not to pollute you would have to capture the soot and other products of combustion, and ideally the CO2 itself from the engine because otherwise it goes into the atmosphere and you have to reclaim it somehow. Maybe an engine that captures CO2 can be devised, but dealing with the other byproducts is still a problem.
Centralized generation of energy makes more sense because then you can either do it cleanly or at least capture everything that would be emitted and deal with it.