Fig. 3. (A) Probability distribution associated with percentage of old-growth forests in the Oregon Coast Range and the expression of the social range of acceptability of old-growth representation during the 1960s prior to passage of the National Environmental Policy Act (NEPA), which ensured public participation in planning processes. (B) Changes in local/regional social values during the mid-1990s (solid arrow and curves) led to a shift in the ecological range of variability (ERV) over the region (dashed arrow and curves) as federal land managers developed new forest plans for the Pacific Northwest region following NEPA policies and other environmental laws and political processes. (C) Because the social range of variability (SRV) continues to diverge from the ecological range of variability as the Northwest Forest Plan is implemented, we can expect policies to continue to shift the range of variability of old-growth forests further to the right.