How much energy does it take to turn CO2 back into oil? Is there a viable synthesis pathway? Carbon neutral oil would be fabulous. I'm guessing you have to spen

How much energy does it take to turn CO2 back into oil? Is there a viable synthesis pathway? Carbon neutral oil would be fabulous. I'm guessing you have to spend a significant amount of energy to turn it back into oil, but is it 1.01x? 1.5x? 10x? 200x? The lower range would be viable to work with other kinds of renewables. Can't store solar at night? Turn atmospheric carbon into oil. It doesn't have to be cheaper than oil (it almost certainly can't be unless it gets too hard to drill), but we can subsidize it within some kind of range. EDIT: Oh cool, some people are trying this. https://www.technologyreview.com/s/407748/making-gasoline-from-carbon-dioxide/ https://www.technologyreview.com/s/407748/making-gasoline-fr... https://www.sciencemag.org/news/2015/09/feature-there-s-too-much-carbon-dioxide-air-why-not-turn-it-back-fuel https://www.sciencemag.org/news/2015/09/feature-there-s-too-...