I have an Environmental Biology degree, it has helped me to get to where I am now as an organic market gardener. It is not a quick path to success, It took me 10 years to get my first related paid job.
I loved the course though, If I had a better degree (a first instead of a Desmond) I'd maybe have progressed quicker.
As a mature student with experience and this course you might find it a good route to employment.
We got to study stuff as diverse as EIA techniques, chaos theory, sociology, psychology, microbiology and of course statistics. Lots and lots of statistics.
I think I'm going to top up my degree with and MSc or similar in something based on sustainability which will tie in with my work experience.
You really have to bide your time and work hard to get the good jobs.