Why don't cars use carbon capture?

Carbon capture means stripping the CO2 out of the exhaust gases of power stations and stashing it underground. But the notion of briging the process to cars is still pretty way out. The obvious probelm is that cars move around so any carbon harnessed from the exhaust must be stored in the vehicle and somehow transferred to a processing facility. Even then, a chemical plant lightweight enough to be built into a car seems like a pretty tall order.

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