The reference collection is a great place to begin your research. These short relevant articles will give the basic understanding you need to formulate a good research question.
Environemntal Studies consists of many different subject areas. If you want to browse either the reference (main floor) or regular (upstairs) collections to find material, I would suggest that you look in the following sections:
GE 1-350 - Env. sciences
GE 70-90 - Env. education
GE 170-190 - Env. policy
GE 195-199 - Green movement
GE 300-350 - Env. management
Other area that may be of interest are listed on the Biology and Chemistry subject guides.