Ideally - has earned the Camping and Environmental Science merit badges.
Is appointed by the Senior Patrol Leader with approval of the Scoutmaster (like most other Troop junior leader positions).
Note - a Scout who wants to help teach Leave No Trace in his Troop but who has not completed the 16-hour LNT Trainer training can serve in the Instructor junior leadership position.
Note - The Leave No Trace Trainer leadership position is a youth position, not an adult position. Adults are encouraged to become Leave No Trace Trainers (by completing the LNT Trainer training), but they DO NOT wear the LNT Trainer position patch.
Leave No Trace Trainer Junior Leaders in the Longs Peak Council