Per Dr. H., you must: "Find a scholarly/peer reviewed article or book chapter that speaks to an interest or critical question you’ve been thinking about with regard to our course content and themes (literature and the environment). The scholarly source you choose must be related to our course (in terms of one of our course authors and/or environmental humanities themes)."
Start with these databases. The chances are good that you will find plenty here.
Recommended search: literature and nature and _____??_____