America is not the exception. More than a few of our states have hundreds of thousands of trees and all need a little loving care. The overhead is low, the pay is high and the skills needed are few.
In areas where trees are found in great quantity the work is done at the request of a homeowner, the city and for some the federal government. Even companies want their grounds looking immaculate and will hire the right guy for the job.
Getting started is not as difficult as most people believe. Take a look at what the average work at home tree trimmer needs to get started.
Start a work at home tree trimming business