It's all relative. They'll use a lot less energy than cars use today. And they won't blast out most of that energy out as heat either. Non autonomous ice cars j

It's all relative. They'll use a lot less energy than cars use today. And they won't blast out most of that energy out as heat either. Non autonomous ice cars just aren't very efficient. And because they are autonomous cars, they will get utilized a lot more meaning we need less of them. People can only drive cars that they own so much. An autonomous car can drive itself, all the time. When it is not driving, it's losing money. So, the most economical thing to do with autonomous car is to utilize the hell out of them and have them driving around people and stuff 24/7 and earning money. Basically, uber without the drivers, tips, etc. So, we gain some more energy in terms of manufacturing efficiencies because we need less vehicles to transport people and goods the same distance. And of course the vast majority of the power used for this is going to come from cheap, clean, renewable sources instead of 100% of it being fossil fuels being transformed into CO2 that is blasted into the atmosphere via the tail pipe. So yes, there is a bit of power involved. But vastly less than what we are spending on transport today. And it will be generated in a vastly cleaner way.