Is there a good source for electric vehicles causing more pollution than modern engines? I haven't seen anything to that effect.

Here's an article that suggests that, in the US, gas cars would need better that 55mpg to have lower emmissions than EVs powered by the grid. In France, because of their different grid generation systems, you'd have to have a car running at 524mpg.

https://phys.org/news/2017-11-emissions-worldwidegas-battery...