Seems like the necessity is simply that the average CO2/joule needs to be lower than a car's ICEs. It's certainly not zero right now, but we're up to 11% hydro

Seems like the necessity is simply that the average CO2/joule needs to be lower than a car's ICEs. It's certainly not zero right now, but we're up to 11% hydro/solar/wind[0], so it seems like it likely is cleaner, and it's getting better at a faster rate than ICEs are. 0[] https://www.eia.gov/tools/faqs/faq.cfm?id=427&t=3 https://www.eia.gov/tools/faqs/faq.cfm?id=427&t=3