GREENR - Global Reference on the Environment, Energy, and Natural Resources.
GreenFile - Subjects: All aspects of human impact to the environment. Coverage includes global warming, green building, pollution, sustainable agriculture, renewable energy, recycling, and more.
Science Direct - Subjects: Physical Sciences & Engineering, Life Sciences, Health Sciences, Social Sciences & Humanities.
Biology Journals (Proquest) - Access to a wide range of biology topics.
Access Engineering - Engineering, Biomedical, Chemical, Environmental sustainable, Energy Petroleum.
IEEE XPlore - Subjects: Engineering and technology
Scitation - Journals and conference proceedings from the American Institute of Physics.
PLOS - Public Library of Science contains peer reviewed journals covering the topics of biology, medicine, computational biology, genetics, neglected tropical diseases, and pathogens.
Nature Communications - Peer reviewed articles expanding over a large range of the sciences: physical sciences, earth and environmental sciences, biological sciences, and health sciences.
BioMedical Central - Provides a wide range of peer reviewed journal articles with a wide range of subjects throughout the life, health, and environmental sciences