Saw this study from UC Davis today about the effect that trail clearing has on recovery after a ski resort is abandoned. They studied 6 abandoned ski resorts in California (Powder Bowl, Plavada, Tannenbaum, Edelweiss, Iron Mountain and Echo Summit) which ranged from 10-43 years of abandonment. The difference in recovery time based on how a run was created was immense. This image shows a difference:
I thought this quote--if it's ideals are taken to fruition--could have some interesting impacts on current ski areas.