At the low-end estimated future price of $20/ton** for carbon capture from the air, the cost of the world's total annual CO2 release (roughly 60 billion tons per year) would be $1.2 trillion dollars. In the last century, humans have dumped something like 3 trillion tons of CO2 into the atmosphere - cleaning that up would be $60 trillion at this very low estimated carbon capture price (which has NOT been reached, not even close). So clearly it is far cheaper to reduce CO2 release now, than pay for its capture some time in the future.
** Present carbon capture schemes from the air are presently more than an order of magnitude higher in cost (like $300/ton).***. At $300/ton, just last year's CO2 would cost $18 trillion to capture. That's $18,000,000,000.00. And the last century's output would cost $900 trillion... With a world population of say 10 billion, that's still $90,000 per person (if everyone pays). Just not happening at that price.
*** When possible, it's much cheaper to capture carbon "at the source", e.g., for a power plant where the exhaust is closer to 100% CO2 versus only 0.000003% in the atmosphere. However, clearly you can't do capture CO2 at the source for your car (it's moving) or at your home, because you'd need your own very expensive deep well and high pressure pump + you need to have favorable geology in the ground beneath you. There are other schemes, but again they don't work for personal use, just for large sources where the economics and chemistry works out ok.
Edit: corrected a numeric fluff, sincerely oops...