Scirus 
A specialty search engine that searches over 167 million science-specific journal articles and web pages from educational, government, organization, and commercial sites. It includes articles in several major scientific journal publishers, including Elsevier. Please note: You may find articles offered to you at a price. Purchasing them is not necessary. The library's Interlibrary Loan department can get most journal articles for you for free. Requests can be made electronically from the library's Request Materials page.

Science.gov
A gateway to over 50 million pages of authoritative selected science information provided by U.S. government agencies, including research and development results.

GreenFILE
GreenFILE  covers all aspects of human impact to the environment. Its collection of scholarly, government and general-interest titles includes content on global warming, green building, pollution, sustainable agriculture, renewable energy, recycling, and more.