As long as we are still burning fossil fuels to generate energy, the idea of capturing the CO2 from the atmosphere is a joke. It would require more than all the energy we have generated since the beginning of the industrial age. Or millions of years of growing non-rotting trees.
Do you have an estimate of the price and time it takes to turn a ton of atmospheric CO2 into carbonates at scale? I only saw stuff that worked with a few tons of already sequestered CO2?