So, the issue is that, as a talking point, it's silly, because we're simultaneously pushing for greener power plants. And economies of scale presumably can make

So, the issue is that, as a talking point, it's silly, because we're simultaneously pushing for greener power plants. And economies of scale presumably can make even dirty power plants more efficient than little power plants packed in cars and sold as cheap as humanly possible. From a human health standpoint, it's probably also better to concentrate our environmental impact in places we can directly combat it, rather than emit garbage all over the place right next to where humans live and work and inhale. It's absolutely true that buying an electric car may not reduce your carbon footprint today. (It may actually increase it, if your old car was still working just fine, because the carbon cost of car production is very high.) But it's an important step on the path forward.