Why electric cars are only as clean as their power supply

I can't help but feel we will look back on charged battery electric cars as an engineering dead-end (once again, 100 years later). I still think turbines, with modern manufacturering tech, are the best short term way forward, and what we now call nuclear or even quantum phenomena will be the catalyst for long term power. Fact is, petrol still has better energy density than any other tech. Additionally, the bulk of toxic pollutants produced by cars are not from the tailpipe but from brake pads, manufacturing, and end of life. 3 things electrics (and hybrids) are notorious for being bad at.

I love the IDEA of a 'clean' car, but it is just ego driven NIMBY-ism masquerading as a virtue signal.