You will need land which don't encroach on agriculture or other industrial use land. Land which gets enough rainfall every year. Also planting is just one step in the process , you will need to maintain it, if the trees actually have to grow.
tree planting ≠ forest planting.
But on that notion a “productive” artificial forest solves this issue.
build forest with plants that provide utility. But are family to the local environment. it’s a concept that has been proven