The second half of the 1960s was a boom time for nightmarish visions of what lay ahead for humankind. In 1966, for example, a writer named Harry Harrison came out with a science fiction novel titled “Make Room! Make Room!” Sketching a dystopian world in which too many people scrambled for too few resources, the book became the basis for a 1973 film about a hellish future, “Soylent Green.” In 1969, the pop duo Zager and Evans reached the top of the charts with a number called “In the Year 2525,” which postulated that humans were on a clear path to doom.

No one was more influential — or more terrifying, some would say — than Paul R. Ehrlich, a Stanford University biologist. His 1968 book, “The Population Bomb,” sold in the millions with a jeremiad that humankind stood on the brink of apocalypse because there were simply too many of us. Dr. Ehrlich’s opening statement was the verbal equivalent of a punch to the gut: “The battle to feed all of humanity is over.” He later went on to forecast that hundreds of millions would starve to death in the 1970s, that 65 million of them would be Americans, that crowded India was essentially doomed, that odds were fair “England will not exist in the year 2000.” Dr. Ehrlich was so sure of himself that he warned in 1970 that “sometime in the next 15 years, the end will come.” By “the end,” he meant “an utter breakdown of the capacity of the planet to support humanity.”

As you may have noticed, England is still with us. So is India. Hundreds of millions did not die of starvation in the ’70s. Humanity has managed to hang on, even though the planet’s population now exceeds seven billion, double what it was when “The Population Bomb” became a best-seller and its author a frequent guest of Johnny Carson’s on “The Tonight Show.” How the apocalyptic predictions fell as flat as ancient theories about the shape of the Earth is the focus of this installment of Retro Report, a series of video documentaries examining significant news stories of the past and their aftermath.

After the passage of 47 years, Dr. Ehrlich offers little in the way of a mea culpa. Quite the contrary. Timetables for disaster like those he once offered have no significance, he told Retro Report, because to someone in his field they mean something “very, very different” from what they do to the average person. The end is still nigh, he asserted, and he stood unflinchingly by his 1960s insistence that population control was required, preferably through voluntary methods. But if need be, he said, he would endorse “various forms of coercion” like eliminating “tax benefits for having additional children.” Allowing women to have as many babies as they wanted, he said, is akin to letting everyone “throw as much of their garbage into their neighbor’s backyard as they want.”