Able to scale a 15-metre tree in fewer than 20 seconds, Alana Murray might be the closest a human could come to Spiderman. "Some people just have the knack for being able to move around a tree.

It was a chilly late November afternoon in Hobart in 1999 when the Wilderness Society's Geoff Law received a call that would turn his day on its head. On the phone was Bob Brown, the Tasmanian ...