I grew up in school doing an exercise called "Duck and Cover". This was intended to protect students from nuclear attack. We were supposed to duck under our desks and cover our heads in case "the bomb'. It's true we are all still here, but the ability to drop a nuclear bomb has spread to more countries. Today we are probably in greater danger than we were back in the 50s when I did those exercises.

As for his predictions about population growth--it's true New York City doesn't look anything like the city he describes in his book. However, one of the biggest issues facing many governments today is the 'immigration crisis'. Where are all these immigrants coming from? From lands where there is not enough food, enough space, enough jobs. So far the U.S. and other developed countries can provide for basic needs, but the pressure from less privileged parts of the world is growing. Harrison was right about that. He asserted that other parts of the world were going to want their share of resources.

How will all of this shake out? Will the scramble for resources result in WWIII? I have no crystal ball.