We would have to know the parameters of CAI, surely. Clean air is nothing to do with CO2, a non toxic gas. It is a greenhouse gas, as is methane and SF6 used in wind turbines. 24500 times more powerful than CO2 Tail pipe emissions plus power station emissions for Hybrids/EVs? The toxin pollution in raw materials, transportation and manufacture? Lithium for batteries. Neodynium used in DC brushless motors can cause huge pollution to mine. It is a complex comparison to which you can add the lifespan and recyclability of the car components. All imho.