Is electricity a source of energy? Most people will answer yes, which is incorrect. Electricity carries energy but it is not itself a source of energy, which in the U.S. is supplied 60% by natural gas and coal, 18% nuclear and 22% renewables (hydro, solar and wind).
The related question is whether cars are a major consumer of energy and hence a significant contributor of Co2 emissions? Again, most people believe both statements are self-evidently true, hence the importance of moving to electric cars.
In fact, cars (light-duty transportation) account for less than 5% of global energy demand, with U.S. cars accounting for 19% of the global car fleet, declining to under 15% by 2050 as car demand grows faster outside the U.S.
Putting these facts together, and they are indisputable facts, provides a stunning insight.
The U.S. car fleet accounts for a mere 1.0% of global energy demand (5% x 19%), declining to 0.8% by 2050. So even if the U.S. shifts 100% to electric-powered cars, the maximum climate impact in 2050 is a meaningless 0.2% (22% x 0.8%) reduction in global Co2 emissions from the current electric grid, up to a maximum of 0.5% assuming solar, wind, and hydro can, implausibly, power 60% of electric demand.
In other words, there is no factual basis to claim that the government mandate to switch to electric cars will have any material impact on global Co2 emissions.
This is not a debatable point — it is easily verified, it is correct under any view of climate science, and it remains true even if solar and wind magically grow sixfold over the next 25 years, which is highly unlikely given the need to build a new transmission network, estimated at more than 200,000 miles of wires crisscrossing the country, and devise totally unknown, unproven, and likely impossible to achieve large-scale, economic battery storage.