Generally, when researching legal issues, it is best to start with secondary sources (i. e., books and articles) rather than to delve straight into the statutes, regulations and court cases. Secondary sources will provide exact citations to the laws and regs, making the process of finding them much faster and easier.
Start with the full text database Lexis Nexis Academic. Click the "Legal" button in the upper navigation bar. Then choose "Environmental Law Review Articles" from the drop-down box, and enter a search term.
In MERLIN, search for books using a topical keyword of your choice plus the phrase "law and legislation," or try subject headings such as these:
Primary source legal material:
The Proquest Congressional database provides keyword searching and full text content for current congressional publications, bills, legislative histories, floor votes, public laws, treaties with Indian tribes and foreign countries. In addition, full-text is available for the Congressional Record (1985-present), the Federal Register (1980-present), the Statutes at Large (1789-present), and Committee Prints (1830-present).