Dorothy StangFeb. 12, 1958: Frank Baxter, an English literature professor who plays "Doctor Research" in a series of U.S. network TV short features, makes the case for climate change in "The Unchained Goddess": "Man may be unwittingly changing the world's climate through the waste products of his civilization." The CBS series is produced by legendary Hollywood producer Frank Capra.

Feb. 12, 2002: In response to rising concerns about arsenic-based chemicals used to treat wood playground equipment, the U.S. Environmental Protection Agency and equipment manufacturers agree to a phaseout of chromated copper arsenate (CCA). By the end of 2003, the cancer-causing chemical’s use in wood products is greatly reduced.

Feb. 12, 2005: Dorothy Stang (at right), an American-born nun who spent 30 years in the Amazon helping the poor and opposing deforestation, is murdered. Two Brazilian ranchers would later be convicted and sentenced to 30 years' imprisonment in 2010.

Photo: Carlos Silva/AP

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