The point here is it&#x27;s easier to control emissions at large-scale power generation plants than it is on millions of individual vehicles. How many cars would fail an inspection if exposed to one?<p>The same cannot be said about power plants.<p>There&#x27;s also the renewable angle. Surplus wind power, as experienced in Spain, would basically provide free power for recharging vehicles overnight. You cannot do this with gasoline.<p>The sealed room is also a way of presenting what we&#x27;re doing to our climate, that the automobile emissions don&#x27;t just go &quot;into the air&quot;, but become part of the environment.