I all too often hear people try to make the argument that electric cars are no better for the environment than regular cars because most of the electricity comes from coal-fired power plants.
What would be great is to find out how much carbon is released when creating the electricity for moving a car 1 mile. Then compare how much carbon is released when burning gas to move an equivalent car 1 mile.
There are many counter-arguments to this idea of coal vs gas. For example, at least coal is produced locally - your money isn't going to 3rd world dictators. Or at least there is the potential to add improved pollution control to the power plants, whereas changing everyone's tailpipe is impossible.
But it would be great if the argument could be won on the same grounds that it was made - carbon output.