For years Americans have been warned that there are too many people in the world, that we're running out of land, food, and everything else needed to sustain an overpopulated planet.
But The Weekly Standard senior writer Jonathan Last says the biggest crisis facing the United States and the world is just the opposite.
In his new book, What to Expect When No One's Expecting, America's Coming Demographic Disaster, Last says the greatest threat to life in America is us -- and our collective unwillingness to have more kids.
Last talked more about his new book and why he believes America is careening towards a demographic cliff, on "The 700 Club". Click play above for the interview.
"Almost all professional demographers, the United Nations, the Population Fund, believe that within about the next 60 years we're going to see global population peak at probably around 9, maybe 10 billion, and then it's going to begin to shrink," Last told Newsmax.
Last warns that unless we change our views about the value of raising children, America faces a bleak future.
"A couple of things happen when you stay below that replacement level for a few generations," he said. "The first is that your age profile inverts so you wind up with many more old people than you have young people."
"Then this presents a whole host of problems," he continued. "It makes your entitlement programs like Social Security and Medicare highly unstable."
Disease, war, and economic collapse are all on the horizon as the fertility rate plummets and our population declines.