When I was a student there was no such a career as Environmental Engineer (I studied Meteorology).
I think it is great that you have that opportunity now!
As I said in my life story, the most important thing to do well in a field is to like the field, so that you will be able to work with passion. I think that engineering is as good paying a field as any other area. If you get a job that you like, I am sure that you will be able to support your family.
With best wishes,