My pleasure @frank1in. To be truthful however, the ecological impact is regional. What's actually happening is the power production is being moved, not removed. If the power you use to charge the car comes from a coal fired power station then the pollution still exists, it's just coming from the power station rather than the tail pipe. If your power comes from hydro for example, then it's a different proposition. Keep in mind the losses in transmission from the power plant to the home socket too! Nuclear power plants then have their own pros and cons. It is quite variable, but removing the "dirtiness" from the point of consumption is a really neat achievement yes!