I've traced source to end user meter point for decades. A skill set I developed originally for understanding how much fission nuke was reaching my home. That understanding morally compelled me off grid. A topic for discussion in itself. Lol. NOthing to do with CO2. In fact, significant "scientific community consensus" of the day still expected an impending ice age due to human (aka blame USA) activities.
But, source tracing CAN be done. Adequate data exists. Data that IS processed. A smart enough EV charging station can report time, date and KWH. So that coal fired portion of a given EV charge cycle can be taxed. A punitive enough tax should impose disincentive to coal fired EV charging? WithOUT punishing folks who just want to stay warm and keep freezers frozen. ???
Governments do far more complex things routinely? I've suggested similar to office help of my elected representatives... Crickets... Lol. Good luck speaking eye to eye with ANY elected ANY one. Lol.
MANY folks are truly, sincerely worried. I'm personally concerned. Not fully convinced, based on lame, grade school level, data published. If correlation = causation, then Earth's diminishing magnetic "shield" also correlates. Arguably. Etc, etc. BUT I'm willing to accept "reasonable doubt" on such a potentially BIG issue that we understand so LITTLE about.
BUT I also KNOW, beyond reasonable doubt, of at least a hand full of "death to great satan amerika" types openly masquerading as environmentalists. Starting with my dear wife's parents. Lol. Any solution that does NOT wreck capitalism is a NONsolution in their thinking. Go figure. Imagine family gatherings? Lol
Historically, where economies crash, ecologies follow... Shortly.