I don't think we have mentioned that among the 300+ databases available through Western Libraries is one specifically to help you find articles about the environment.  Give GreenFILE a try.

Full text reports on agriculture and economics

We just added this to the list of library databases: AgEcon.  It contains thousands of full-text reports (conference presentations, journal articles, etc.) on the intersection of agriculture and economics.  Here are a few titles we found on a recent search:

ALLOCATING BIOSECURITY RESOURCES IN SPACE AND TIME (2011)
SALMON RECOVERY IN THE COLUMBIA RIVER BASIN: ANALYSIS OF MEASURES AFFECTING AGRICULTURE (1999)
What is the Difference in Profit per Acre between Organic and Conventional Coffee? (2012)
MANAGING ENVIRONMENTAL RISK IN PRESENCE OF CLIMATE CHANGE: EVIDENCE FROM ETHIOPIA (2012)
An Overview of the Canadian Agriculture and Agri‑Food System 2012
Wildfire Hazards: An Analysis of Duration, Cost, and Size (2012)