Scopus indexes scholarly literature on environmental sustainability and related fields. In includes articles, conference papers, book chapters and more.
Web of Science is a comprehensive source of academic literature on the topic of environmental sustainability, including major research domains in Science Technology and Social Sciences.
ProQuest provides a large number of resources on environmental sustainability including; scholarly journals, newspapers, trade journals, books and more.
In addition to the larger databases above, have a look at the databases listed on the International Development Library guide
Here are some other databases which are relevant to research in Environment & Sustainability.