Search these committee web sites for hearings and other legislative materials and learn about the issues.
Congressional Hearings available at Middlebury are included in MIDCAT and LibrarySearch. Recent hearings can often be found on Congressional Committee websites.
In addition, try:
TIP: Newspapers and magazines usually don't have footnotes or bibliographies but they at least mention the sources of their information, which are often reputable policy think tanks or organizations. Search their websites.
American Environmental Policy: Beyond Gridlock by 
