After reading that you wanted some input on the Environmental field, I handed the computer over to the Hub who is currently working as a CIH (Certified Industrial Hygienist) for the Feds. He has done quite a bit of hiring in the field so he knows whereof he speaks.
Hi!
PhD in chemistry, been in and out of the field for around 10 years.
My personal experience was that the educational environment can create some misleading expectations about the world of employment. Higher education can be a two-edged sword-it can allow you to qualify for higher level positions, but it also can price you out of the market. Also, many employers don't want to deal with the ego and expectations of someone with too many degrees. All of which is to say, don't cut your ties with your employer now-the fact that you can do a job now, and show up sober, and get along with people when tempers flare are traits employers value, and which are never tested in school. I would try and keep working for your present company while you picked up a degree somewhere.
Heartily agree with everyone above-GIS skills are rapidly becoming a critical discriminator among applicants. Good luck!