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Old growth is a relatively new, and admittedly fuzzy, concept.
At its most elemental it means a forest of old trees. But other conditions need to be present in order for most ecologists to consider a forest truly old growth. They look for old wood on the ground, a multilayered canopy, and no sign of human disruption of the forest's natural processes. The last condition is usually the most compromised. All the rational arguments for the preservation of old-growth forests biodiversity, watershed protection, climate control won't answer that question.