We get energy by extracting oil and burning it. It takes a lot more energy to do the reverse.

We already cannot stop burning oil today because the economy would implode. I don't think that it is reasonable to think that not only we could stop burning oil entirely, AND at the same time produce more energy than we got from oil just for extracting the CO2 from the atmosphere... And the reality is even worse than that, because on top of all that* we would need more energy to... live.

It's important people understand that we cannot extract the CO2 once it's out there. It's practically impossible, period.