We already have shortage of building-grade wood, because it needs to be grown for 60-90 years, while today's wood is cut at 30. Younger wood is softer, attracts bugs, rots easily.
Wow! so much scientific conversation and not one thought about gazillion of animals who live in those trees. Did you guys know earth was doing pretty fine with just trees and animals before all these tech, or even their talk, appeared in the scene.