June 14, 1972: The U.S. Environmental Protection Agency (EPA) announces a ban on DDT to take effect at the end of the year. The pesticide is identified as a cause of the decline of bird species from bald eagles, pelicans and peregrine falcons to hummingbirds.
June 14, 1974: Researchers Gene Likens and F. Howard Bormann publish a paper in the journal Science, the first peer-reviewed work recognizing acid rain as a "serious regional environmental problem."
June 14, 1988: A small wildfire starts in Montana just north of the boundary for Yellowstone National Park. The Storm Creek fire expands into the park, then merges with dozens of other drought-inspired fires. Over three-quarters of a million acres of Yellowstone — 36 percent of the park's area — burns before firefighters gain control in late September.
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