Paul Ehrlich, in the 1970 “Earth Day” issue of The Progressive, told readers that between 1980 and 1989, some 4 billion people, including 65 million Americans, would perish in the “Great Die-Off.” He stated elsewhere that that “air pollution … is certainly going to take hundreds of thousands of lives in the next few years alone.” Ehrlich sketched a scenario in which 200,000 Americans would die in 1973 during “smog disasters” in New York and Los Angeles.
Peter Gunter, a North Texas State University professor, wrote in 1970, “Demographers agree almost unanimously on the following grim timetable: by 1975 widespread famines will begin in India; these will spread by 1990 to include all of India, Pakistan, China and the Near East, Africa. By the year 2000, or conceivably sooner, South and Central America will exist under famine conditions….By the year 2000, thirty years from now, the entire world, with the exception of Western Europe, North America, and Australia, will be in famine.”
In January 1970, Life reported, “Scientists have solid experimental and theoretical evidence to support…the following predictions: In a decade, urban dwellers will have to wear gas masks to survive air pollution…by 1985 air pollution will have reduced the amount of sunlight reaching earth by one half….”
Ecologist Kenneth Watt declared, “By the year 2000, if present trends continue, we will be using up crude oil at such a rate…that there won’t be any more crude oil. You’ll drive up to the pump and say, `Fill ‘er up, buddy,’ and he’ll say, `I am very sorry, there isn’t any.’”
Harrison Brown, a scientist at the National Academy of Sciences, published a chart in Scientific American that looked at metal reserves and estimated the humanity would totally run out of copper shortly after 2000. Lead, zinc, tin, gold, and silver would be gone before 1990.
Sen. Gaylord Nelson wrote in Look that, “Dr. S. Dillon Ripley, secretary of the Smithsonian Institute, believes that in 25 years, somewhere between 75 and 80 percent of all the species of living animals will be extinct.”
Kenneth Watt warned about a pending Ice Age in a speech. “The world has been chilling sharply for about twenty years,” he declared. “If present trends continue, the world will be about four degrees colder for the global mean temperature in 1990, but eleven degrees colder in the year 2000. This is about twice what it would take to put us into an ice age.”
In 1988, in an article titled, “Global Warming Has Begun,” said that “If the current pace of the buildup of these gases continues, the effect is likely to be a warming of 3 to 9 degrees Fahrenheit [between now and] the year 2025 to 2050…. The rise in global temperature is predicted to … caus[e] sea levels to rise by one to four feet by the middle of the next century.”
In the years 2007, 2008, and 2009, Al Gore made statements about the possibility of a complete lack of summer sea ice in the Arctic by as early as 2013, and indicated in his movie, An Inconvenient Truth, that sea levels could rise by 20 feet, putting many coastal cities under water.
On June 2, 2009, ABC aired a show called Earth 2100, in which it was predicted that by June 8, 2015, gas would be over $9 per gallon, milk would cost $13, and that New York City would be mostly under water.