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[–] ScientiaPotentia 0 points 2 points (+2|-0) ago  (edited ago)

Trees multiply quickly to fill in spaces between them. So if you plant a line of trees 10 metres apart within a couple of years a tree shoot up somewhere in the radius of each tree and they propagate from there. That's how forests grow. Trees propagate and fill the spaces between them over time. All they would have had to do is plan a few thousand trees or even just spread seeds and wait. The tree growth will propagate exponentially until density limits growth. It's still a massive undertaking and an immense amount of work though.