The amount of carbon that plants can capture is literally negligible.

The amount plants capture is already engaged in what you might term the Carbon Cycle. Which also demonstrates that plants' and animals' direct emissions are literally negligible, because these processes and the plants' recapture are or were exactly equivalent, and balanced.

Add to this hundreds of billions of tons of carbon from coal, natural gas, and oil, and that's the problem. This amount of carbon was formerly buried, out-of-the-way, below ground. Now it's in the air, and dissolved in the ocean. The plants are preoccupied with the amount of carbon there used to be in the air. This extra amount is beyond them.

But it's also unlikely Arizona is going to make hundreds of billions of tons of concrete, to sequester the difference.