![Tesla Supercharger site in Rocklin, California, before expansion [photo: George Parrott]](https://images.hgmsites.net/tmb/tesla-supercharger-site-in-rocklin-california-before-expansion-photo-george-parrott_100614958_t.gif)
Despite electric cars producing no tailpipe emissions, not all of their effects will be environmentally beneficial, according to a recent report by McKinsey & Co. The group, which is often optimistic about electric car adoption, forecasts that by 2030, plug-in cars will make up at least 20 percent of car sales globally, and up to 35 percent in...