What he's saying quirt is that if you don't have any aspirations in this field beyond dragging brush for a half ass paycheck, you're better off doing something indoors. The heat/cold makes the weaker links break if you know what I mean.
If you're someone who enjoys being outdoors year round, isn't afraid of heights, and is willing to work your ass off to get any respect at all, then there's a career for you in this line of work. Hardworking climbers are needed everywhere and some employers are willing to pay good money for the right set of skills. Anyway, just figured I would throw in my two cents, good luck if that ends up being your choice..