Atlanta Constitution (1868-1984) Atlanta Daily World (1931-2003) The Chicago Defender (1909-1975) Chicago Tribune (1847-1993) Christian Science Monitor (1908-2003) Detroit Free Press (1831-1999) Los Angeles Sentinel (1934-2005) Los Angeles Times (1881-1992) The Michigan Chronicle (1939-2010) The Nashville Tennessean (1812-1922) New York Amsterdam News (1922-1993) New York Times w/ Index (1851-2013) Pittsburgh Courier (1911-2002) The Wall Street Journal (1889-1999) The Washington Post (1877-2000)
CQ Researcher is a GREAT place to look for some background information on your topic. The articles are about 20-25 pages in length and provide a well-researched overview. Since we now have online content back to 1923, you could use this to get a historical perspective on some of today's environmental issues.