There is no rat
The carbon footprints have been examined and it really is lower for EVs, even factoring in the generation of the power... furthermore, only 60% of US power generation is from fossil fuels now, and that will continue to decrease. Solar has actually become the CHEAPEST form of power generation...
So - in short- EVs in general have a lower carbon footprint than conventional cars, and as we move to more carbon free power sources for our power grid that will only get better.