Besides costs, how long it would take to develop, to implement, and what resources it would need are critical. If the polar ice caps and enough glaciers melt be

Besides costs, how long it would take to develop, to implement, and what resources it would need are critical. If the polar ice caps and enough glaciers melt before we implement it at scale, we will lose a lot of the potential benefit. While trees do it, they only restore the CO2 they released when we cut them down. They won't restore what was released from oil brought up from underground. We could in principle plant more trees than we cut down, but people are living and farming in many of those places. As of now, there is nothing in action and little if anything on the horizon. In general, since CO2 is released when we get energy, you'd need to put that energy in to get CO2 out, which would take away energy from the economy. So a process that took energy would need us to create all the energy our economies needed plus the energy to remove the CO2 without releasing more CO2. Your question is basically saying, "why don't we just undo the problem?" Sure, sounds great, why don't we just solve all problems by undoing them? Why don't we just end wars by having the combatants sign peace treaties? Well, creating the agreements to sign is the challenge.