More emphasis on environmental education. Check all that apply. The best way to get such a job is education and experience. Definitely a bachelors degree is necessary. This can be in education, the biological sciences, or history, or park and recreation.
Summer jobs abound, but be willing to go where the jobs are.
The largest number are in urban areas, but with a little experience, you will more likely be able to pick an area in which you would most like to work. You cannot be promoted from a temporary position to a permanent position, but the experience gained from seasonal work is directly applicable to permanent positions. Just career exploration.