An anonymous reader writes: A few articles came out Thursday talking about the recently released report from the National Bureau of Economic Research on the environmental benefits of electric cars. The general consensus is kind of obvious -- that it depends on the ratio of coal vs. clean electrical generation that is used to charge your car. What is interesting is the extent to which it makes a difference, and that when viewed on a regional basis, there are cases where the EV doesn't do so well. And when it comes to policy decisions, it seems the central focus needs to be on the replacement of large-scale coal generation, and the rest will fall in to place. Here is one cover story from Ars Technica. Google others for varying perspectives.