Marina: I agree with Jeff. You might want to consider minor in Statistics. Statistics "focuses on theories and methods of data collection, tabulation, analysis, and interpretation." Having a strong knowledge in statistics definitely helps you become a better environmental biologist. At the same time, it may open additional doors (career paths) that's simply not available for a Major in Environmental Biology.
Jackson recommends the following next steps:
As an undergrad at PSU, I was in the college of Health and Human Development. I do not know which college your major is in, but you can just explore the minors page on your colleges website and see what you might want to study. Also, you can work with your advisor on how to incorporate that minor with your major. Your advisor will know how to pair different minors with an Environmental Bio major!