GreenFILE is a free research database covering 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.

The Gale OneFile: Environmental Studies & Policy is a digital resource that answers inquiries about environmental concerns with coverage of more than 5.4 million articles from more than 300 journals and book reference content from Delmar, including Soil, Science, and Management; Introduction to Agronomy; Food, Crops, & Environment; Fundamental Soil Science; and more.

Environment Complete is a leading full-text database for environmental studies. It provides hundreds of top environment journals covering ecosystem ecology, energy, environmental policy, sustainability and other related subjects.