Al Gore in a scene from Feb. 25, 1976: The New York Department of Environmental Conservation (DEC) bans fishing in the upper Hudson River due to PCB contamination from two General Electric factories at Hudson Falls and Fort Edward. Litigation and cleanup of the Hudson continues to be an issue well into the 21st century.

Feb. 25, 2002: A jury finds the Monsanto Corporation guilty of polluting neighborhoods near its Anniston, Ala., facility with PCBs. The plaintiffs receive an average of more than $7,000 each. Their attorneys, including famed trial lawyer Johnnie Cochran, collect fees in the millions.

Feb. 25, 2007: "An Inconvenient Truth," a documentary featuring former U.S. Vice President Al Gore (at right) explaining the threats of climate change, wins the Academy Award for Best Documentary.

Photo: Paramount Classics/AP

This feature is compiled by Peter Dykstra, an MNN contributor and publisher of Environmental Health News and The Daily Climate.