The greatest problem of the 21st century is world population, not global warming or the price of oil. This is the problem that drives all other problems, especially climate change. This is the problem that is most likely to cause excessive deaths in the billions. Yet there is no question that the world population problem will be resolved in this century one way or another, for good or for bad.
What is not going to happen is that the world population will continue to grow at the exponential rate that it has since the start of the industrial revolution. If it did, it would reach 35 billion people by the year 2100. The Earth will simply not support such a population.
What is going to happen is that world population will continue to growth for a while, peak, drop, and then settle to sustainable level. The United Nations estimates peak at about 9.2 billion people will occur in 2050.
The UN does not make any prediction of the sustainable level. There is a good reason for this. We can still affect this number. The sustainable number will probably be between six billion and two billion. This is the number that is now up in the air. The actions we and our students take will powerfully affect it.
Three approaches to addressing the world population problem are currently in use:
The whole subject of world population is a third rail for politicians. If they touch it, their political careers are over. Too many people are stuck with the present system, after all it is the one that produced the enormous success of the human species over all the Earth. They do not see that it also got us into to our present problems, and do not want to even talk about the available solutions.
This inability to face reality prevents politicians from using a systems analysis for the big picture. If you cannot look at a top level problem, you cannot deal effectively with any of the other interrelated problems. The politicians are stuck dealing with today's catastrophe or searching for a non-existent silver bullet. Most of the work must therefore be done by NGO’s.
This topic has the greatest potential for teaching an understanding of the source of our problems, the historic significance of these times, and how personal decisions effect world outcomes. It also addresses some of the most difficult problems that both teachers and students will face.
This topic is so controversial that not one will even talk about it. Contact me if you have the guts to take it on.

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