In 1970, Republican President Richard Nixon signed an executive order creating the United States Environmental Protection Agency (EPA). It was a time when pollution made many of our nation's rivers and streams unsafe for fishing or swimming. Back then, New York City's air pollution was so thick that you often couldn't see the city's iconic bridges. Forty-seven years later, there is serious talk of dismantling the agency, or at least slashing its size by two-thirds.
From 1971 to 1977 the nascent agency, in an act of prescience, enlisted the services of freelance photographers to help us remember. These photographers captured images of America's environmental problems before we'd cleaned them up. In 2011, the US National Archives digitized more than 15,000 pictures from the series "Documerica". Here are some of the most compelling.
If you like these images, please read our series on the EPA past and present. It begins here.