[Lammy]

The Smart People in the USA realized population growth was a Bad Thing Actually™ and got really into saving the environment in the mid-1960s after we ended racism and poverty forever and needed something even more noble to do: https://books.google.com/ngrams/graph?content=segregationist...

edit: https://files.eric.ed.gov/fulltext/ED050960.pdf#page=13

"We have all heard about a population problem in the developing nations of Asia, Africa and Latin America, where death rates have dropped rapidly and populations have exploded. Only recently have we recognized that the United States may have population problems of its own. There are differing views. Some say that it is a problem of crisis proportions — that the growth of population is responsible for pollution of our air and water, depletion of our natural resources, and a broad array of social ills."

SUBTLE