You seek to solve problems that are more or less un-solvable. All you can usually do is "the best you can." And every now and then you find something Great. But you will travel a long road between successes and positive feedback—stressful. You are something of a "nature detective." A "Recycle Green Poirot," if you will. (You probably won’t.) While this makes your job interesting, it can also make it quite stressful if you are not solving your mysteries.