Carbon sequestration doesn't necessarily mean driving combustion in reverse to get oxygen and hydrocarbons again. Accelerated silicate weathering could remove a lot more atmospheric CO2 per unit of energy invested and it generates carbonate minerals rather than fuel that people would be tempted to burn again. Like this, "Enhanced weathering strategies for stabilizing climate and averting ocean acidification": http://www.southampton.ac.uk/assets/imported/transforms/cont...
That's pretty cool! Non fuel forms of sequestered carbon hadn't occurred to me, though you would still need to fund the process. Using a carbon tax to fund it as a government function seem likes the obvious solution if it were to be implemented at scale.
