Weather control

I recently read that trees planted in an alpine environment benefit twice.   Once from the tree's normal metabolic habits, and twice because the roots reach into previously sealed rock, exposing oliveine and similar minerals to weathering.   This gives me an idea.
We dig massive holes into the mountains.   After a year's time, we fill the hole back up, ending with a sapling.   This maximizes weathering, resulting in the best possible carbon sink for the area.