Earlier quoted context omitted.
All resource problems are energy problems. With enough clean energy, you can make fuel, water, fertilizer, anything. We're going to need a lot of surplus energy to sequester all of the CO2 we've pumped into the atmosphere over the last 100+ years.
The weird part about sequestering is that if it's really going to work, people will need incentive to simply put all that energy in to the ground with no immediate benefit for them. You either need heavy government regulation or for everyone involved to be thinking about the larger picture. I wonder if anti aging technology would push people to start seeing climate problems in its larger context.
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...