One of the common, albeit misguided, criticisms of electric vehicles is that they get their electricity from coal, thus making them effectively more of a pollutant than a traditional ICE car. I seem to recall a video of either JB or Elon debunking that claim. If my memory serves me correctly, the topic is discussed at the beginning of the video in an effort to explain, generally, why electric vehicles are the answer to sustainable transport. It goes to other subjects, but they demonstrates exactly why a electric cars powered even by dirty coal power plants are still more efficient and environmentally friendly that ICE vehicles. Of course, less than 50% of the United States' grid power comes from coal, but the data presented was still of interest. Hopefully someone has the video bookmarked somewhere!