It's not like our power is from 100% renewable sources... We are still dependent on coal for power generation. So, either way you are contributing to the pollution. Also, the initial carbon footprint for EVs interms of rare earth metals mining and purifying are very high in comparison to the ICE ones. So, atleast untill the dependency on coal for power production is reduced or we have our solar setup, i don't think environmental impact is less by using EVs at all.