Academic Search Complete: A multi-disciplinary database that indexes literature from more than 4,400 peer-reviewed journals. Search smart by putting each unique concept on it's own line. Then add like terms with ORs. Choose to limit your results to peer reviewed sources.
GreenFILE: A database of literature about human impact to the environment. Includes scholarly, government and general-interest titles. Allows you to limit to peer-reviewed sources.
Agricultural & Environmental Science Collection: Includes scholarly journals, trade and industry journals, magazines, technical reports, conference proceedings, and government publications. Allows you to limit to peer reviewed sources.
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