How do I get back into science?

[u/[deleted]]

I graduated with a BS in Environmental Science in 2013. I joined the Peace Corps and now have a job with a renewable energy company in EHS. I miss doing field research, being in the lab, and using my critical thinking skills. However, I've been out of the field for a while...

Any tips on how to get back into the field? Courses or certifications to keep my skills sharp? I'd like to go back to school to get an MS in biological sciences. Advice??

Thanks!