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Reforestation was the act of planting tress where they were once cut or damaged. It is a practice done most of the time back on Earth. So forests simply don't just disappear, workers plant trees, most of the time already grown seedlings into the ground where other bigger ones were cut. Progressively they cut trees only to add more saplings. This way there's a constant cycle and the forests never truly disappear.
With the help of Emeraldine, we enchanted the tree seeds we found from within these very trees and I sent my Phantom Familiars to plant them all around the forest. With that done, the forest quickly began to gain several saplings, which began growing rather rapidly.
"I guess you actually had a plan, you scared us a lot back then… Also you're not chopping more?" Wondered Brunhild.