A tree can be killed in a single season if improperly climbed. Leg spikes, like those used by pole climbers should never be used. Techniques using a rope moving over a branch can injure or even kill a branch on a single climb if the bark is thin. We are loosing far to many trees to land developers and loggers to add recreational climbing to a long list of hazards facing our tree population. That's not saying trees can not be climbed without damage.
Proper technique is the key.
TCI is a grass roots organization. That means we need the support of our membership and strongly encourage the members to become involved in an active way. Please look at the volunteer section and check a section that interests you. This does not mean that you need to make a big commitment. Our fast paced society has taken away most of our time.