I've been involved with urban forestry for almost two decades. Not sure if this is what your looking or but it's still dealing with trees just in a more urban setting. It's a very demanding line of work that can get you up to thirty dollars an hour if your any good. CDL and and arborist certifications help in getting you on the higher end of the scale. I am MA certified and each year I have to obtain a certain number of credits to maintain the license. NH has a program also. I've spent many years working out of a bucket but mostly have been a climber doing pruning, cabling and removals. I get paid to climb during the week and on the weekends I climb for fun. Not getting enough rest days would be my only complaint but other than that quite an exciting occupation.